centerboard sailboat definition

What is a Sailboat Centerboard?

Last Updated by

Daniel Wade

June 15, 2022

A sailboat centerboard is a retractable fin that protrudes from the bottom of the hull. The centerboard keeps the boat stable and on course.

Centerboards are an important and often overlooked part of a sailboat, but they're essential to stability and effective navigation. Centerboards perform the function of a keel and keep the boat on course regardless of wind direction. Centerboards are primarily found on small trailerable vessels, which vary in length from 12 to 25 feet.

Table of contents

How a Centerboard Works

Centerboards look similar to fin keels, but they have one notable difference: they're retractable. Small sailboats use centerboards for stability and to keep a straight course, especially when sailing windward .

Technically speaking, a centerboard is a rudimentary form of a hydrofoil. In practicality, it's like a rudder that always stays amidships. This is beneficial, as it forces the boat to track a straight course regardless of what direction the wind is blowing.

Without the centerboard, the wind would push the sailboat in whatever direction it was blowing. Tacking would be nearly impossible, and attempting to sail windward could simply knock down the boat. In this sense, the centerboard performs the same function as a fixed-keel.

Centerboard Sailboat Characteristics

Centerboard sailboats are typically less than 25 feet in length and designed for shallow water. In fact, centerboard boats are perfect for shallow water. Cruising in lakes and rivers is a joy with a centerboard boat, as the board can be retracted for towing, beaching, or skimming over shallow water. Centerboard sailboats are the ultimate shoal-draft vessels.

Centerboards descend from a hollow cavity in the center of the boat. This cavity is called the centerboard trunk. Some centerboards are removable and slide vertically into the centerboard trunk. Others are hinged or enclosed, allowing them to be raised and lowered from inside the cabin without removal.

Removable Centerboards

Removable centerboards are usually found on the smallest sailboats. These blades tend to be roughly twice the length of how they look from under the boat. This is because the centerboard trunk has to be above the waterline. Remember, the centerboard trunk is effectively a hole in the boat, so it can't be the same height as the water.

Enclosed Centerboards

Enclosed centerboards are common on mid-sized and larger 'small' boats. They're especially common on vessels equipped with cabins. The primary benefit of an enclosed centerboard is water tightness, as the board is housed within a sealed centerboard trunk.

Enclosed centerboards can be raised and lowered from inside the cabin and never needs to be removed from the boat. They're also shorter (overall) than removable centerboards, as they don't mount to the very top of the high centerboard trunk.

The primary drawback of enclosed centerboards is increased complexity and access issues. But in most cases, small centerboard craft are not usually in the water long enough for severe growth issues. Additionally, retracting the board can protect it from excessive marine gunk.

Hinged Centerboards

Hinged centerboards (or 'swing keel' centerboards) are the most common enclosed variety. Hinged centerboards pivot on a forward hinge. They're long and thin and sometimes stow in a hidden centerboard trunk that's mounted to the bottom of the hull.

These 'stealth' centerboard trunks free up cabin space at the expense of a few inches of draft. Hinged centerboards offer an increased level of grounding safety, as they retract on their own if they hit the ground (instead of shearing off). It's the collapsing steering column of sailboat keels .

Advantages of Centerboard Sailboats

The primary advantage of a centerboard boat is its inherent shoal-draft capability. That means centerboard boats can go a lot closer to shore than fixed-keel vessels. They can even go on shore, and drying out during low tide is rarely hazardous. They sit upright on dry land, and they're easy to trailer around.

The cost to construct, own, and maintain a centerboard cruiser is often far less than a traditional fixed- keel sailboat . This is primarily because you usually don't need a crane to pull it out of the water. Centerboard boats are often small and light enough to leave on a trailer, and their small size avoids excessive marina fees.

Disadvantages of Centerboard Sailboats

Can you cross an ocean in a centerboard sailboat? Most would caution against it. Some would say, "absolutely not," but it has happened a time or two. The issues with centerboard sailboats are size, displacement, draft, and stability, which cause problems in rough weather.

Most centerboard sailboats are only comfortable in calm coastal and inland waters. Conditions aboard a shoal-draft sailboat in foul weather range from uncomfortable to downright perilous, which is a major tradeoff. Additionally, small centerboard sailboats typically lack the cabin and storage space necessary for seagoing provisions.

Also, most small centerboard sailboats simply aren't designed for extended cruising. Things like generators, VHF radios, large freshwater tanks, and bathroom facilities usually aren't up to the task on small boats.

Centerboard Sailboat Propulsion

The smallest centerboard sailboats, such as Sunfish and Laser racers, have no propulsion system other than the sail itself. However, anything beyond 15 feet in length will probably have some alternative propulsion. Small boats have an oar or two on board, but most utilize a 5 to 10-horsepower outboard motor.

Inboard motors are rare, but a one or two-cylinder marine diesel can sometimes be found below the cockpit of a centerboard cruiser. Some small 'motor-sailer' boats have inboard engines and a centerboard for sailing.

Best Centerboard Sailboats for Cruising

Centerboard sailboats are ideal for coastal and inland cruising, and many of these pocket-sized vessels include surprisingly comfortable accommodations. These aren't dinghies or converted rowboats; they're serious sailing vessels in a compact package. Here are a few of the best 'all-around' centerboard sailboats available today.

Catalina 22

The Catalina 22 is one of the most popular sailboats ever built. It has the profile of its larger cousins (like the Catalina 27) but features a compact swing keel centerboard instead of a fin keel . At 22 feet long, the Catalina 22 is about as hardy as centerboard cruisers get.

And thanks to its retractable hinged centerboard, there's enough cabin space for a V-berth, porta-potty, stove, sink, settee, and a convertible dining area berth. The trailerable Catalina 22 is widely available on the used market, often for entry-level pricing.

West Wight Potter 19

The West Wight Potter 19 is a small centerboard pocket cruiser with a cult following. It's a fiberglass V-bottom trailer sailboat with a spacious cabin, retractable centerboard, and foldable mast. This little cruiser is capable and convenient, and it's still produced today.

West Wight Potter sailboats are famous for being (quite literally) unsinkable. They're loaded with flotation foam and stay afloat even when completely flooded. Plus, they're easy to sail, and they have an enormous amount of natural stability.

The Hunter 22 is a remarkably well-balanced centerboard cruising boat. Like the Catalina 22, this Hunter sailboat features a compact swing-type retractable centerboard. It has a spacious cabin with room to accommodate the whole family on short voyages.

Hunter designed this compact cruising sloop with a masthead rig, which is simple to operate and robust. These vessels were only produced for a few years in the 80s, but variants are plentiful, and they're plenty of fun to sail.

Centerboard Vs. Fixed Keel

Are you interested in buying a sailboat ? Deciding between a centerboard and a fixed keel is an important decision that shouldn't be overlooked. If you're looking for a trailerable weekender for short voyages and an occasional offshore run, then consider a centerboard. They're cheap and easy to store in or out of the water.

Centerboard sailboats are also ideal for island hopping, as long as the islands aren't too far from your homeport. Florida to the Bahamas is a common and manageable journey for cruising centerboard boats.

And since centerboard sailboats tend to be smaller, it's important to consider how much provision storage you'll need for the journey. Running out of food or fresh water isn't much fun in the middle of the ocean.

Fixed keelboats are ideal for extended offshore voyages and coastal cruising, especially in choppy waters. A fixed keel cruising boat offers superior roll comfort, stability, and handling in a wide range of weather conditions. They're safer in storms as well. For serious sailing, it's difficult to find an ideal alternative.

Related Articles

I've personally had thousands of questions about sailing and sailboats over the years. As I learn and experience sailing, and the community, I share the answers that work and make sense to me, here on Life of Sailing.

by this author

Sailboat Parts

Learn About Sailboats

Most Recent

What Does "Sailing By The Lee" Mean?

October 3, 2023

The Best Sailing Schools And Programs: Reviews & Ratings

September 26, 2023

Important Legal Info

Lifeofsailing.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies.

Similar Posts

Affordable Sailboats You Can Build at Home

September 13, 2023

Best Small Sailboat Ornaments

September 12, 2023

Discover the Magic of Hydrofoil Sailboats

December 11, 2023

Popular Posts

Best Liveaboard Catamaran Sailboats

December 28, 2023

Can a Novice Sail Around the World?

Elizabeth O'Malley

4 Best Electric Outboard Motors

How Long Did It Take The Vikings To Sail To England?

10 Best Sailboat Brands (And Why)

December 20, 2023

7 Best Places To Liveaboard A Sailboat

Get the best sailing content.

Top Rated Posts

Lifeofsailing.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. This site also participates in other affiliate programs and is compensated for referring traffic and business to these companies. (866) 342-SAIL

© 2024 Life of Sailing Email: [email protected] Address: 11816 Inwood Rd #3024 Dallas, TX 75244 Disclaimer Privacy Policy

What’s the deal with Centerboards?

Most of you who have followed our journey for some time are familiar with our somewhat infamous centerboard issue, where we ran aground in the Illinois river in 8′ of water when our boat should only draw 4′ .  This was the most dramatic and expensive example of the issues we’ve had with the centerboard thus far, but that’s not to say it’s been the only trouble our centerboard has caused us.

In this week’s video, This Little Thing could SINK our Boat , we’re highlighting another pain point and some of the additional maintenance that comes along with having a pivoting centerboard. We’d like to take this opportunity to talk a little bit about the pros and cons of the centerboard system and shed some light on how we’ve been using it with real life examples.

Sailors love to talk shop. It seems everyone has an opinion when it comes to boats, and if you’re not too careful, it can lead lead to hours upon hours of enjoyable and sometimes educational discussion. Invariably anytime we get beyond the general pleasantries of “She’s a beaut!” or “What’s the length?” we know with more and more certainty that we’re talking with a sailor. As the questions get more specific e.g. “How much fuel do you carry?” or “How tall is the mast?” we will eventually hit this question: “What’s the draft?”

Up until this point, it’s only a Q&A session, but as soon as we divulge the boat has a centerboard — and that with the board up we draw between 4-4.5′ but when it’s down closer to 8′ — the discussion will turn one of three ways:

• The questioner wasn’t quite prepared for that answer and is dumbstruck because they didn’t know as much about boats as they thought they did, and were unaware of the centerboard concept or are unaware a boat of our size could have a centerboard.
• The questioner’s face lights up with a twinkle in their eye and responds with something like: “A perfect Bahamas boat, nice!”
• The questioner’s face scrunches up with terror in their eyes: “Why on god’s green earth would you want to maintain a system like that!”

And after three years of owning, maintaining and traveling aboard a boat with a centerboard, we’ve been in each of these 3 camps at one point or another. Let’s dive in and tackle each point of view.

What is a centerboard on a sailboat?

A centerboard is a retractable appendage that pivots in and out of a slot (centerboard trunk) in the hull/keel of a sailboat. Having the ability to raise and lower the centerboard allows the the boat to operate in shallow waters when lifted, while maintaining good upwind sailing characteristics with the centerboard down. Similarly, lifting the centerboard reduces the wetted surface area, resulting in lower drag while sailing downwind. This combination of characteristics makes it possible to build a safe, seaworthy boat, capable of easily sailing upwind off a lee shore, while still allowing the boat to tuck way up into shallow anchorages when necessary.

When first looking for our sailboat , weren’t specifically looking for a boat with a centerboard. It wasn’t on any “avoid ” list of ours either; it just wasn’t on our radar. So when we first saw the boat online and noticed it had a centerboard, we were pretty ambivalent about it.

Is that like a Swing Keel?

Many people have incorrectly referred to our boat as having a swing keel, and for good reason as they are quite similar on the surface. Before finding our boat, we were aware of other boats with swing keels (specifically Southerly Yachts  popularized by “ Distant Shores “) and some of their unique benefits. While the swing keel is similar on the surface, it’s an entirely different animal from our centerboard. They both feature large underwater wing-shaped appendages that pivot from underneath the boat to provide additional wetted surface area to reduce leeway and increase lift for sailing upwind. The main difference is that in a swing keel boat the pivoting appendage is actually the keel. In cruising boats, swing keels weigh several thousand pounds, while centerboards weigh a couple hundred. Thus, a swing keel also contains a large part of the boat’s ballast, so the position of the keel can have a substantial effect on the stability and motion of the boat. Additionally, when retracted all the way up into the hull, the boat can be left to dry out while sitting upright in the sand — pretty cool.

Distant Shores II, a Southerly 480

The flip side is this: In the fully retracted position, the keel needs somewhere to go — which takes up interior volume of the boat. Additionally, moving an extremely large and heavily ballasted keel up and down requires some serious mechanical gear, and unless the swing keel is lowered to some extent, there is nothing counteracting the force of the sails to prevent leeway and the boat will not sail to windward.

Whereas with our boat, in addition to the centerboard, we have a shoal draft keel (which actually doubles as a housing for the centerboard). Even without the centerboard down the boat will still sail to windward. Dropping the centerboard only serves to increase the pointing ability and windward performance. The centerboard does not contribute meaningfully to the ballast of the boat (as it weighs about 200lbs), so its effects on stability in the up or down position are muted. It is designed primarily as a hydrofoil to prevent leeway when sailing upwind and is significantly lighter than its swing keel cousin. Lastly, by retracting into the keel instead of all the way into the hull it does not have any negative effect on the interior volume of the boat.

What are the benefits of having a centerboard on a sailboat?

Besides increased upwind sailing performance, the major benefit of a boat with a centerboard is a shallow draft. For our needs navigating the inland river system, sailing the notoriously shallow Gulf of Mexico , and cruising Bahamaian waters, these are fantastic qualities to have in a boat.

The inland river system has a controlled depth of no less than 9′ in the channel from Chicago to Mobile, Alabama, but most of the channel is significantly deeper than that. However , s earching for marinas and anchorages for the night where you have to exit the channel means the depths start changing quickly. With our shoal draft keel we were able to sneak into a number of marinas with sub 5′ depth at their entrance or at the dock that would’ve been impossible in many other sailboats of our size. Even in Mobile we ran aground twice while moving through the marina to get to our dock.

In the Bahamas we find ourselves anchoring way up towards shore with the catamarans instead of much further out near the monohulls. Yet when it comes time to sail to windward, we’re able to drop the board and point much higher than we otherwise would’ve been able to with the shoal draft keel alone. This can shave miles off long passages and minimizes the number of tacks required in a tight channel.

Additionally, dropping the centerboard just a little bit can give us much better handling in tight quarters, as it prevents the bow from falling off downwind when trying to dock in strong crosswinds.

This all sounds pretty good, right? Why would you not want a boat with a centerboard?

What are the issues with centerboards?

With all the apparent benefits, you’d think the centerboard would be a no-brainer. And if you’re purely concerned with performance, then absolutely, it is. However, the centerboard represents an added layer of complexity that just isn’t absolutely necessary for the operation of the boat. Along with this added complexity comes additional maintenance to ensure the system continues operating normally, and even then, when everything is operating correctly, the maintenance itself can create some stressful situations. Below are a few of the negatives of having a centerboard we’ve discovered so far:

General Maintenance

Our centerboard is raised and lowered via a control line, or centerboard pennant. The line is always underwater inside the centerboard trunk, and is incredibly difficult to inspect. The line exits the boat below the waterline meaning we have an unprotected thru-hull without a seacock to close, should there be a leak. The through-hull is connected to a hose and the hose connects to a conduit in the mast that rises well above the waterline.

The centerboard line runs through this conduit and then exits the mast through a sheave at the deck level. It then runs through a turning block and clutch/winch to lock it off. Each of these items require some level of maintenance and/or at least inspection on a regular basis. These are all fairly simple parts, and the system is quite well-designed. However you can probably already imagine some of the issues…

Stepping & unstepping the mast is more difficult

Because the line runs through the mast, stepping and unstepping the mast requires a few more steps to ensure everything goes smoothly. When unstepping our mast, we need to temporarily slacken the centerboard pennant to allow the mast to be raised out of the boat. To ensure we can run the line back through the mast we need to run a messenger line in the mast to be able to retrieve it again when re-stepping.

When re-stepping the mast, extra care needs to be taken to ensure the mast doesn’t get hung up on the centerboard pennant or the conduit it runs through. We’ve heard of other boats stepping their mast only to realize later that they pinched their centerboard control line.

Naturally (or accidentally) slackening the centerboard pennant allows the centerboard to drop, increasing our draft to 8′, unless it’s secured in some other way. We did this at the start of our river trip by securing a line athwartship from each of the midship cleats to act as a set of suspenders to keep the centerboard pinned up inside the trunk. Unfortunately this wasn’t tight enough and slipped off the centerboard allowing it to drop into the fully-down position. This set us back a few days as we fabricated a much stronger system to secure the centerboard line using an exit sheave at the mast partners.

The centerboard trunk is difficult to clean & paint

While our boat was hauled out, we repainted the bottom with CopperCoat . However we were unable to paint the centerboard or the trunk with the same. Had we known better, we would’ve pulled the centerboard immediately after hoisting the boat out of the water with the travel lift. But since it was our first time hauling the boat for storage, we didn’t realize that once we were moved to the hydraulic trailer which the yard used to position boats, we would not be able to get enough height to drop the board and remove it.

We did hang in the slings over the weekend prior to splashing, which gave us time to get underneath the boat with the board down to clean the centerboard trunk and repaint the board and trunk with ablative bottom paint. But we couldn’t repaint with CopperCoat because of how long it needs to dry before being splashed.

The centerboard pivot point is difficult to inspect

The centerboard pivots on a large stainless steel hinge. This plate is bolted into the keel of the boat and has a large pin that runs through the centerboard allowing it to pivot around this point. There is also a heavy duty stainless eye on the backside of the centerboard that the pennant line connects to. Both of which are always submerged in water, and while they are stainless, stainless corrodes in environments lacking oxygen. So these parts need to be inspected on a regular basis, and this means removal of the entire board, which is easier said than done.

The centerboard can get stuck in the up or down position

The centerboard is designed to pivot up and down in the trunk with fairly small tolerances on either side. Any more space than what is needed to get the board out, and it will interfere with the flow of water over the hull, increasing water resistance and drag. Any extra space will also allow sea life to make its way up into the trunk.  Thankfully it’s very dark up in there, there isn’t much water flow carrying nutrients into that space, and we have been diligent about keeping it clean. While we haven’t run into this particular issue yet, we’ve heard of some boats that have had so much growth in the trunk that they can’t get the board to move.

While, we haven’t had our board stuck in the up position, but we have had the board stuck down. The centerboard is a hydrofoil, so the leading edge is a bit wider than the trailing edge, much like an airplane wing. And whereas dagger board trunks (where the board drops in vertically) can be contoured to follow the shape of the board almost exactly, our centerboard trunk is rectangular, as it needs to accomodate the width of the leading edge moving all the way through it. This means the trailing edge of the board (which is on the top when in the retracted position) leaves a lot of extra space between it and the trunk, creating a wedge shape… Maybe you can see where I’m going with this…

A perfect storm scenario can brew under just the right conditions. Imagine for a moment you are loosening the centerboard pennant line to drop the board down, but for one reason or another, the sideways pressure of the water against the board when sailing upwind, growth in the centerboard trunk, stops or slows the dropping motion of board — perhaps it even gets pushed back up slightly as the boat pitches forward and backward in a large wave. You, as the unsuspecting crewman, continue to slacken the line thinking the board is dropping, but in reality what is happening is the line comes to rest on the top of the board, and because of the wedge-shaped trailing edge, the line slips down ever so slightly between the board and the trunk, and gets trapped .  Once there it wedges in between the board and the trunk making it extremely difficult to move.

This has happened to us twice. The first was an easy fix, which occurred during a daysail after purchasing the boat. We could’ve easily addressed it without getting into the water, but it was hot, the water was clear, and despite being warned about this particular scenario, I didn’t have a good visualization of what was happening and wanted to see it for myself.

There is actually a built-in mediator of this problem which saved us considerable effort: A short section of exhaust hose with a diameter that almost exactly matches the width of the centerboard trunk serves as a conduit for the last 18″ of line of the centerboard. This prevents the slacked line from getting wedged in too tightly and allowed us to break it free with a tiny bit of force.

The second time however, was much worse, and is covered in detail in Episode 24 . We were in the Illinois Sanitary & Ship Canal, in incredibly disgusting water with no visibility, and because we hadn’t secured the centerboard line properly, the board unbeknownst to us dropped all the way down, and under zero tension actually hung forward of its pivot point. In this position, the geometry for pulling it back up is all out of whack.  With the protective hose completely out of the trunk, pulling the control line, only wedging it further in between the trunk and the centerboard.

So is a centerboard actually worth it?

While we’ve been both super happy we have a centerboard and a shallow draft, we have also been exasperated by the extra maintenance, sometimes wishing we had a “normal keel.” But at this point we’ve circled back around to mostly ambivalent.  The maintenance while sometimes stressful is all part of owning a boat and the benefit of having a shallow draft when needed are immeasurable.

In reality, we probably only use the centerboard 15-20% of the time we’re actually sailing. If you think about the benefits discussed above, it’s really only necessary in moderate upwind scenarios, which we often avoid anyway. It’s just way more comfortable sailing downwind! We’ve also found in light wind conditions the extra drag created by the centerboard outweighs the pointing ability it generates, so we leave the board up. To top it all off, when we’re not actually sailing (which is most of the time when the boat is at the dock, at anchor, or hauled out for storage) the centerboard is always in the retracted position. For the actual lifespan of the boat, the centerboard is in the down position much less than 10% of the time.

On more than one occasion I’ve thought that I’d rather have a keel full of lead where the centerboard trunk exists now. It would give us added stability 100% of the time, we’d have no additional maintenance, and we’d only miss out on the benefits 10% of the time. However that 10% of the time could potentially make all the difference if we really needed to get off a lee shore. Whenever we are using the board — i.e. upwind especially in a narrow channel or maneuvering under power in tight quarters — we’re often saying to each other “Thank goodness for the centerboard!”

In the end, as with everything on a boat, it’s a trade-off.  There’ll always be pros and cons of every design decision. There isn’t one right design for every boat or every boat owner. Overall, we’re happy with our Tartan37c  and would not pretend to know more than the S&S design team who dedicated their lives to designing these spectacular boats.

Let us know what you think!

Do you have any experience with a centerboard? Did we miss anything? We’d love your feedback.

This ONE LITTLE THING could SINK our Boat

How to Run Aground in 8’ of Water When You Only Draw 4’

About the Author: Kirk

Related Posts

Building a Sailrite 3-Bow Bimini

Coppercoat as a DIY Project

Is Coppercoat the Best Antifouling for Your Boat?

21 comments.

We had a centerboard on our very first keelboat, a William Tripp designed Polaris 26. Sailing in Michigan on Lake St. Clair, it was a great feature as we could gunk-hole into all kinds of places. Our horror story was that we once forgot we had it down when sailing into a shallow bay and we touched and pivoted under a pretty brisk wind. That was enough to slightly torque and twist the centerboard foil such that it would only retract about 1/3 the way up before getting jammed in the trunk. We had to sail the rest of the season that way until we were hauled out for winter and the yard could bend it back flat. Our subsequent three boats have all been shoal draft versions, which opens up a whole ‘nother discussion of the merits of shoal keel versus deep keel on the same boat model. Fortunately, we switched our home port to Charlevoix 20 years ago, where sailing depths are almost never an issue on Lake Charlevoix/Lake Michigan/Lake Huron. As you said, everything is a compromise with sailboat design. We were glad we had the shoal draft when we delivered our current boat from Annapolis to Charlevoix last year. We draw 6′-6″ and we bottomed out three or four times in the Erie Canal (supposedly a 9′ controlling depth, but who’s counting?). The deep keel version of our boat draws 7′-6″, so we would have never made it back to the Great Lakes. We are eventually going to be bringing this boat back out to the Atlantic permanently when we retire and plan to cruise the Bahamas and the Caribbean, so even the 6’-6″ shoal draft is going to be less than ideal. But hey, if Delos can do it, hopefully we can. Best to you and Lauren.

Jeff W SV Échappé Jeanneau Sun Odyssey 54DS Charlevoix, MI

Thanks Jeff, 6’6″ is the shoal draft?! We were so thankful for our 4’6″ draft in the Abacos. We could anchor in so many great places!

Yeah as usual your videos and blogs are so helpfull to use on my tartan too, you guys are my teachers, when I bought the boat I had the problem with growth inside the trunk, I left the line loose by unexperience and in a sail trip it went down with the shocking waves, I didn’t know it happened and then on another short trip we ran aground because I didn’t know the keel was down. But after that it got cleaned and all works perfect, thanks!!!

Good to hear! Rest assured, if you’ve done it, we probably have as well!

I had many maintenance issues with the centerboard system on my T 37. I managed to drift into shoal water while anchored with the centerboard half down – a position I often used to reduce roll. This resulted in breaking the lower 3/4 of the centerboard off. I recovered it and on next haul out, epoxied it back together and reinstalled it. Next haul out, the SS pivot assembly had a problem in the flange that received the pin – had to be re-fabricated. A couple of years later (I went way too long without a haul out from this point) the bolts holding the pivot assembly became loose and I was unable to lower the centerboard as the pennant was the only thing keeping it in the boat. Sailing with it up didn’t seem problematic.

It all sounds pretty familiar. I think we have a love/hate relationship with ours. 😉

Hello and love your information, site, etc. Your trips are completely unique to me and the blogs and video are welcome adventures. Keep on cruising and writing. Please.

Centerboards: I was raised sailing all manner of boats with them. We had a 48 Alden yawl with a centerboard. I think it went down twice! We cruised Cape Cod, the US East Coast into the Keys, and Bahamas in that boat and all the reasons to have a board were apparent. I was a kid then and wondered why anyone would build a boat without a centerboard.

Then, I started racing and fell in love with deep draft. Our boat now is 32 feet long and draws 6 feet. Oh my, do we go to windward! We have raced a T37 (same handicap) and we out point him but he out foots us and usually finishes ahead. Cruising is not about hours of close hauled sailing. I get it now!

In our harbor and on the next mooring is the referenced T37 that I am coming to love. Pretty boat and shallow draft. Back to my youthful exuberance for a centerboard. If you guys find you way up to the Cape, I hope we see you. Look into Stage Harbor.

Norm Martin Averisera

Hi Norm, thank you for sharing your story. It’s interesting how some boats just reach out and speak to certain people. All the best!

I have a membership in a sailing club with a collection of Capri 22’s that are not all identical. We have weekly races with them, where you show up and draw boat names out of a hat. One of them has a shoal draft keel, it is always the least favorite draw. Typically, while you might be able to point the bow upwind, it’s moving sideways far more than they other boats (regular keel versions of the same boat). But every now and then the wind is just right, and she’ll clean up, just own every race, but this is rare, relies on just right wind (5-10 knots) and tide conditions that allow her to get speed without being pushed leeward. Downwind, she also has a slightly shorter mast (several others also have shorter masts), but still usually keeps up. Possibly an advantage, but not sure. A centerboard would clearly help her upwind in some conditions. But it’s often going to be hard to really see those conditions without head to head comparisons and if your not caring you can just start the engine.

Sounds about right. That shoal draft boat likely does well on downwind legs given there is less surface area under the water.

We’re definitely not the fastest boat to windward, but we’re not racing. There some shoal draft boats that simply can’t sail upwind at all when the wind picks up. They have too much windage and not enough leverage on the water. We will hit hull speed at 30 degrees apparent in 15 knots apparent wind, which I’m quite happy with 🙂 All the best!

A daggerboard is a centerboard, just as one is an integer and a whole number. If the daggerboard is off center it is a leeboard.

Is that so? I always heard it as a centerboard pivots and a daggerboard slides up and down. But I suppose your explanation makes sense!

You guy’s are such centerboard rookies, but then again, most sailors are. I cruise the extremely shallow waters of the Southeast coast of the US and have always sailed centerboard boats for over 40 years, In fact my present boat is a Presto 36, a 18,000 displacement, ketch rigged, true or pure centerboarder, designed in 1884 by Ralph Middleton Munroe. I have no external keel at all, except for a 9″ X 6″X 12′ long lead grounding shoe, designed for “taking the Ground upright”. My draft, board up is 2′-6″ and approx.. 5′-6″ ” board down. The board weights approx. 400 lbs. My centerboard pendant, a 3/8″ super synthetic line runs upwards from the aft end of the centerboard trunk, to the cabin top via 1-1/4″ SS tube and is attached when it exits the top of the cabin, to a simple 6 to 1 tackle to help raise and lower the board. My centerboard trunk runs almost the entire length of the main cabin and has a 2″ dia. hole in it’s aft end. That hole and a short length of broom handle are extremely helpful for for coaxing a resistant board into going down as needed. I have spent many days pleasantly aground on a convenient sand bar, for recreation or maintenance needs and many a night secure in the knowledge, that no matter how busy the surrounding water are, I’m freed from the worries of getting “run” down in the night. Incidentally, I oft use the board along with my mizzen in assisting in self-steering. Never needed any auto-pilot. Up wind, she’s a drag, but any other course, with her sheets eased, she simply can’t be caught..

My wife and I have a Bristol 35.5 with a centerboard. Our installation is much simpler than the one Tartan came up with – I was very surprised when I saw that yours comes up though your mast. Ours is on a wire winch on the cabin house that runs through sealed pipes over sheaves to the board. I’d say that the vast majority of the issues you’ve had with your board are due to that somewhat quirky design. That said, I’ve always loved the look of the Tartan, and you guys have definitely made fantastic improvements.

My wife and I thoroughly enjoy your channel and following your adventures. Keep them coming!

It is a bit of a quirky system, but running it through the mast is kind of a neat way to hide the control line, which needs to enter and exit the hull and deck. It does present some challenges, but it’s neat out of the box thinking. As you know everything on the boat is a tradeoff, and overall we’re extremely happy with the boat. Thank you for watching!

Hi, how confident are you with the centre board in heavy weather … blue water … hove-to? We are going to look at a 47′ sloop with one tomorrow. I love our current smaller steel boat with a full keel but who knows …

Hi Melissa, Tartan 37s have sailed in every ocean on the planet, there have been multiple circumnavigations. As long as we keep the boat properly maintained, I have confidence in it. I don’t know what type of boat you’re looking at or what type of sailing it was designed for, but I don’t think there is anything fundamentally wrong with a centerboard. Good luck!

We have a 79 Irwin 39 with shoal draft an centerboard, the pennant is mid deck and runs through the sole to cabin top” stripper pole” that is attached to the galley and also serves as handhold under way, the pivot is a SS pin that runs abeam and is puttied over, I need to remove this soon as there is a bit more play in this joint than I’m comfortable with, The boat is very tender and we are contemplating the best way to add ballast to the keel as it heels very quickly and carries a lot of sail. The centerboard isn’t very effective when she’s on her ear for limiting leeway losses . She draws 4’3″ up and 9’6″ down, I never thought about partially dropping to improve turning so am excited to try that when maneuvering around docks. I’m hoping adding some lead will make it less tender and will be pursuing this after haulout.

Peter, sounds like you’re at the beginning of a fun adventure learning more about your centerboard and how it can improve the handling of your boat. It was a fun learning journey for us, and we really began to respect the purpose and design of the CB.

I have a 1966 Morgan 34. The bronze centerboard has deteriatiated beyond repair. Especially in the hinge pin and pennant attachment area Draft board up 3 1/2 ft, board down about 7 ft. Bronze board is at least 250 lbs, about 5 ft long, and is a great template

1..Any guidance on where I can get a replacement , perhaps Foss Foam?

2. Is the weight important to proper deployment. Sure cranks hard..a challenge for an old fart to raise

Hi Capt Ron, sorry to hear of your CB woes. Unfortunately I don’t have any sources for replacement. Weight is important, the heavier the better, to an extent. You obviously want to be able to lift/lower it under your own power. At a minimum you need some weight at the bottom of the CB to prevent it from floating and get it to drop down and stay down while underway. But the more weight you can drop down there the better.

Leave A Comment Cancel reply

Save my name, email, and website in this browser for the next time I comment.

Centerboard VS Daggerboard The Differences Explained

As an Amazon Associate, we earn from qualifying purchases. We may also earn commissions if you purchase products from other retailers after clicking on a link from our site.

Sailing life entails many words that at first make no sense; in this article, I will explain the difference between two types of underwater foils, centerboards and daggerboards.

On a sailboat, the difference between a daggerboard and a centerboard is how they are moved into position. A daggerboard is lifted and raised vertically (up and down) through a slot in the hull; a centerboard, on the other hand, pivots or swings into place.

That was the short answer. There are many more commonalities and differences worth discussing, such as the differences in performance and what happens if your daggerboard hits a reef? Will it break your hull?

Keep reading to understand all you need to know about daggerboards and centerboards!

Table of Contents

Centerboard

The centerboard is mounted horizontally on a rotating bolt at the foremost part of the foil (keep reading to understand what a foil is). It folds into a comparatively much longer slot in the hull than a daggerboard.

A centerboard comes in many different shapes and sizes, it can be combined with an already existing keel, or it can be larger and be more of a stand-alone type.

How is a centerboard operated?

The centerboard is operated through a lifting line fastened at the end of the centerboard fin(board); this line is manipulated either by hand or by a winch and, once fully retracted, will be tied to a cleat.

Daggerboard

The daggerboard, on the other hand, is mounted vertically inside a sliding slot in the hull, it gets it name from the movement, much like the stabbing motion of a dagger.

The board is stopped from moving too far and falling out because the top part is wider than the lower part.

How is a daggerboard operated?

It is manipulated much like the centerboard, through a lifting line and a winch. But instead of being attached through a bolt and swung into position, it is lowered down into place.

What are the differences?

Performance.

Since the differences mainly lie in the way of deployment, there are not that many big difference, but some smaller once worth noticing are;

The daggerboard doesnt have to be either fully up or fully down; this means the sailor can adjust the depth and effects to his or her needs. To low and there will be unnecessary drag, to high and there will be too little lift and too much drift to windward.

On the other hand, the centerboard pivots into position and is only really efficient as a foil once fully deployed.

Reducing the draft of a boat is very important if you want to sail in very shallow waters such as the Bahamas or if you want to beach your cat.

What is beaching a cat?

Once retracted, there is also a decreased chance of getting stuck or tangled up in a fishing net or other semi-floating objects and sometimes hard to see.

On boats where the keel is the lowest point on the boat, the propeller will be protected, but on ships where the center or daggerboard is the lowest spot, then retracting it will make it vulnerable to damage from whales, fishing nets, or coral. You will also not be able to beach your cat since the weight of the ship will be loaded on top of your prop shaft and most certainly will break it.

Once the boards are in a fully lifted position, there is an argument to be made that the centerboard, which has a much larger slot, will have higher drag. This is true, but only if the slot is poorly design and not hydrodynamically smooth, causing underwater turbulence.

A well-designed centerboard should be able to reduce the amount of drag to the same as a daggerboard.

What are the similarities?

Both systems can be mounted in pairs and at an angle; this makes the boards work much as an airplane wing does. Once the water starts passing around it, it will create higher water speeds on the upper side, lowering the pressure and increasing lift.

This makes for less underwater surface, decreases drag, increases speed, and fuel efficiency.

One issue often discussed on forums and with boat people is that a centerboard is safer since if an underwater object hits it, it will fold back into its slot, and no damage will be done. This is true to a degree but worthy of some explanation.

Firstly this is mainly a theoretical argument since an object is not certain to hit the board from straight on; this means that the idea of folding is no longer possible. The next thing to understand is that daggerboards are made to break; this is a safety aspect and makes sure that the hulls stay intact and that the boat will stay afloat.

This is similar to modern mini keels on catamarans; they too are constructed to detach if hit hard enough, the keels fall off, but the hull stays intact.

Both systems offer a risk of getting stuck; some say this is a bigger issue with daggerboards, and they more often fail than the centerboard style. This is not something that I have been able to confirm through any data, and looking at the design of newer daggerboards; there is no real reason to think that this should be the case.

There are many different systems on a sailboat, and everything that can move will sooner or later stop moving due to rust or being filled up with salt and sand. So will too these boards; this means extra time for maintenance and extra money to be spent keeping the systems in good shape.

Compared to each other many would argue that the centerboard is a somewhat simpler system and that they need less maintenance; I would say it is more up to the specific design than whether or not it is a centerboard.

Catamarans and Monohulls

The basic function of a foil is the same whether you’re on a catamaran or a monohull, although some aspect is specific for a cat.

A catamaran will always have two boards; these can be used together or separately. Since a catamaran behaves very differently in big seas than a monohull, the use of foils, especially during heavy weather, is essential to understand if wanting to stay safe.

One situation when catamarans can capsize is while being pushed horizontally by a big breaking wave hitting it from the side. If both boards are down, this will decrease the possible sliding motion and therefore increase the likelihood of capsizing.

This is a complex issue and if you want to undestand capsizing in detail i suggest you read this article;

Why do catamarans capsize

Owner of CatamaranFreedom.com. A minimalist that has lived in a caravan in Sweden, 35ft Monohull in the Bahamas, and right now in his self-built Van. He just started the next adventure, to circumnavigate the world on a Catamaran!

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Save my name and email in this browser for the next time I comment.

Recent Posts

Must-Have Boat Gear for Catamaran Sailors!

Sailing is probably the most gear-intensive activity I've ever done; there are so many decisions to be made about what gear to buy now, for tomorrow, and what to definitely never buy. The gear on...

6 Best Trailerable Trimarans For Bluewater and Coastal Sailing

Having a boat costs a lot of money, even when you are not using it, marina fees, etc. And once it is in the water most sailors never go very far from their "home marina" and sailing will be somewhat...

Choosing a Centerboard or Fixed Keel Sailboat

• Snowboarding
• Scuba Diving & Snorkeling

Centerboard or Fixed Keel?

You need to consider many different questions when deciding what kind of sailboat is best for you .

Depending on the general size range of the sailboats you may be interested in, you may need to choose between fixed-keel boats and centerboard (or swing keel or daggerboard) boats. This article will help you choose which is best for your needs.

As only a very general rule, most sailboats over 20-something feet have fixed keels. Most sailboats under 15 feet or so have centerboards. But there is a wide range of boats from 12 to about 25 feet with either a fixed keel or a centerboard. For example, in this photo, ​the boat on the left has a fixed keel, while the boat on the right, of about the same size, has a centerboard.

If you are shopping for a sailboat in this range, you should understand the differences between these fundamental types of keels.

Fixed Keel Sailboats

Virtually all large racing and cruising sailboats have a fixed keel. A keel is needed to keep the boat from being blown sideways at all points of sail except downwind. A keel also provides weight low under the water to lower the boat’s center of gravity below the waterline, which is needed so that the boat bobs back upright if knocked over by wind or waves.

Sailboats have many different types of fixed keels , such as full keels (see photo) and fin keels. If you decide a fixed keel boat is best for your sailing purposes, consider also which type keel best meets your needs.

Centerboard Sailboats

On centerboard sailboats, the centerboard functions like a keel to keep the boat from being blown sideways. (All sailboats need a keel of the board for this reason: the narrow, flat surface of the board or keel produces little drag when the boat moves forward but resists motion sideways.)

The centerboard usually hangs down below the hull from a pivot at one end. It can be raised by pulling a line that swings the centerboard up into a centerboard trunk along the center of the boat, as shown in the photo.

Some small boats, like a Sunfish, have a removable daggerboard rather than a centerboard. The daggerboard has the same function, but rather than swinging down, it is inserted like a blade down through a slot in the hull to protrude like a thin keel below the hull. A swing keel is another term used for a type of keel that like a centerboard can be raised.

A centerboard may or may not be weighted. If the centerboard is weighted, then it also provides weight low in the water, like a keel, to help keep the boat upright (although not as much weight as a fixed keel can supply). If the centerboard is not weighted, like the fiberglass centerboards of many small sailboats, then sailors must keep the boat upright by positioning their own weight on the upwind side of the boat. 

Benefits and Disadvantages of Fixed Keel and Centerboard Sailboats

Fixed keels and centerboards each have their own benefits but also disadvantages. When deciding what type of boat to buy, be sure you have considered these differences:

Advantages of a Fixed Keel:

• Provides the most ballast to resist capsizing and ensure recovery from a capsize
• More effective at preventing leeway (sideways movement of the boat)
• Crew do not have to position body weight to prevent capsizing (see photo)
• No centerboard moving parts to break or jam

Disadvantages of a Fixed Keel:

• With deeper displacement, the boat cannot enter shallow water
• The boat is heavier for its size (usually an issue only when trailering)
• With deeply fixed keels, the boat may not fit on a trailer at all (25 feet is typically the largest trailerable fixed keel sailboat) - requiring the inconvenience and expense of a boatyard for launching, haulout, and storage

Advantages of a Centerboard:

• The centerboard can be raised to decrease displacement to allow the boat into shallower water – and it should swing up and back if it hits the bottom when sailing with it down
• The centerboard can be raised for faster downwind sailing
• The centerboard can be partially raised if needed to provide better boat balance
• Most centerboard boats can be trailered and easily launched and hauled out on boat ramps (larger centerboard boats may require deeper ramps)

A popular trailerable centerboard sailboat is the MacGregor 26 , which with its water ballast has the advantages of centerboard boats but not all the disadvantages.

Disadvantages of a Centerboard:

• Provides no (unweighted board) or less (weighted board) ballast, compared to a fixed keel, to resist capsizing and ensure recovery from a capsize
• Less effective than a larger fixed keel at preventing leeway (sideways movement of the boat)
• The centerboard trunk takes up space in the boat’s cockpit or cabin
• The centerboard pivot and control line involve moving parts and can jam or break

Finally, some historic crafts have leeboards instead of centerboards; these boards, mounted outside the hull on both sides, can be pivoted down like a centerboard to resist leeward motion. And some sailboats have fixed keel-centerboard combinations, which provide ballast and prevent leeward motion even when the centerboard is up but also provide the option to attain less leeward motion sailing upwind when the board is down.e a centerboard to resist leeward motion. And some sailboats have fixed keel-centerboard combinations, which provide ballast and prevent leeward motion even when the centerboard is up but also provide the option to attain less leeward motion sailing upwind when the board is down.

• Choosing an Inboard or Outboard Engine
• Learn How to Sail a Small Sailboat – 1. The Parts of the Boat
• Buying a Used Boat Online
• Control Your Tiller Without a Tiller-Tamer
• The Types of Sailboat Rudders
• How to Heave To a Sailboat
• Using AIS on Your Sailboat
• How to Anchor a Sailboat
• How to Tow a Dinghy Behind a Sailboat
• The Sunfish: A Perfect Lake or Urban Sailboat
• Tricing Pendants and Lifeboat Rigging
• How to Raise the Mainsail
• How to Gybe a Sailboat
• Best Sailing and Boating Apps
• When to Adjust Sailboat Sails for Stronger Winds
• How to Boat

How a Gybing Centerboard Works by Alexander Meller, with Larry Tuttle,  11/14/2003.

Home » Library » Rigging and Project Archive » How a Gybing Centerboard Works

A number of people have questioned how gybing centerboards work. The diagram included here should illustrate what they are and how they work:

The drawing is of two centerboard trunks, each containing a centerboard, viewed from straight above. Imagine the two boats are parallel, sailing from the bottom to the top of the page, on port tack. The centerboard trunk on the left has a conventional non-gybing board – you can see the parallel sides of the CB head up against the sides of the centerboard trunk.

The centerboard trunk on the right has a gybing board in it. The CB head does not have two parallel sides, rather the head is a parallelogram. Since the boat is on port tack, the centerboard is loaded on the leeward – right hand – side, and rocks to weather in the trunk. That is because the axis of rotation (vertical) is behind the center of area, and more important center of pressure of the board. Gybing boards take an angle of attack relative to the centerline of the boat.

While gybing centerboards with angles of attack of over 4 degrees have been built, Waterat and Lindsay foils are in the 2.5 to 2.8 degree range.

The boat’s leeway angle is determined by the net side force on the sails and the area and effeciency of the foils. The hull has a small effect. An estimate of the average leeway angle is 4 degrees, so the boats in the diagram are actually sailing slightly to the right of straight up on the page.

This means that for a given set of conditions and equipemnt, if you change from a fixed to a gybing CB, the leeway angle will not change. What will change is that the bow will rotate to leeward about 2.5 degrees.

Then things get interesting. The sailplan is rotated with the hull. So the there is less drag on the hull, and you can sheet the sails for the lower heading. This causes the boat to sail faster, which creates more lift. So you point higher. Lift increases as the square of the velocity.

The effect is the most dramatic in conditions where the boat accelerates easily, flat water.

If you merely steer the gybing board equipped boat higher, then you go slower, and the board may actually achieve a higher angle to the water flow.

The gybing board is most effective in light to medium air and flattish water. In windy conditions you do not want the centerboard to gybe. Fortunately the centerboards are designed so that by bringing them up very slightly, part of the airfoil blade goes inside the centerboard trunk, and jams at full width, stopping the centerboard from gybing.

Though Lindsay no longer makes foils, a number of North American 505s are still equipped with them. Gybing 505 centerboards are available from Waterat Sailing Equipment in Santa Cruz California, Milanes & White in the UK, and a number of other sources.

For further information on 505 centerboards

Two Bransford Eck articles on 505 foils from old Tank Talk magazines:

Bransford Eck Article 1

Bransford Eck Article 2

The University of Palermo Italy conducted a centerboard study ending in 2008. The University had chosen the 505, because it is one of the few existing classes that has not significant size and shape restrictions on the centerboard. Many class members provided data and feedback and now finally the results have been published. The report is a theoretical study on how to improve the 505 centerboard. Only one prototype was created and used on a 505 in Palermo  prior to the WC. Unfortunately the prototype broke during a high wind test, due too poor construction, and no other prototypes were subsequently built. If you love technical readings, this publication might be of interest to you:

University of Palermo CB Study

Benefactor Members

Robert Woelfel II Thomas Hurwitch Tyler Moore Mike Holt Duane Delfosse Tim Murphy Aaron Ross Craig Thompson Bryan Richardson David Shelton Howie Hamlin Adam Lowry Mike Martin Eric Anderson Reeve Dunne Chris Pittack Ted Conrads Sol Marini Andrew Forman Blaine Pedlow David Burchfiel Curtis Hartmann Dustin Romey Matthew Breton Peter Scott Bruce Edwards Mike Zani Jason Breeden Fred Grimm Matthew Barry Clark Hayes Keith Longson David Kirkpatrick Jeff Miller Paul Kueffner Ryan Nelson Rob Waterman Matt Merchant Paul Kurr Ian O'Leary Jimmy Franzone Adam Wolnikowski

Terms and Conditions  | Privacy Policy

© 2024 505 Class - American Section.

• Classifieds
• Improve Your 505 Sailing
• Rigging and Project Archive
• Annual General Meeting
• National Officers
• Constitution

State   Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming We will have one of our regional ambassadors reach out to you.

Sign me up for the newsletter!

You may have heard that 505’s are some of the most well-made dinghy’s around. Many 505’s can stay competitive for an indefinite period of time when well cared for. Some older 505’s were not built as well, and may not be worth spending time and money on to get back on the race course. This page is organized in a way to help you determine which boat is right for your own 505 sailing goals. Visit the list of builders for more information on all the various 505 builders throughout the years. Also, hull numbers are sequential, and are issued upon initial measurement after the boat is built. The minimum weight of a 505 (weighed with all equipment required for racing except sails) is 127.4kg or 280.9 pounds. Many boats have lead corrector weights (50% located at front of CB trunk, 50% located at rear of CB trunk) to bring the boat up to this minimum weight.

The used boat ads on this page are organized based on the following classification scheme:

The Surtees Service Award was dedicated at last year’s NA’s to commemorate outstanding service to the American Section. The inaugural award was presented to Ali Meller.

It is a pleasure to introduce the 2003 winner of the Surtees Service Award – Jesse Falsone.

As all of you know, Jesse is the epitome of the “go-to guy” for our Class. When a valuable role within the American Section needs to be filled, Jesse has never been afraid to put his money where his mouth is and step up to the task.

In the eight years that he has been in the Class, Jesse has served as both Class Secretary/Treasurer, and President of the American Section.

Upon “retiring” as Class President, Jesse took on the role of Tank Talk Associate Editor, and over the past few years, no one has contributed more material to Tank Talk than Jesse.

Jesse is an incredibly focused competitor who has always found time to pass his knowledge along. After working for years to become one of the top 5o5 crews in North America, Jesse published a compendium on “High Performance Dingy Crewing,” utilizing both his knowledge and that of other top NA 5o5 crews. This pamphlet runs 33 pages, and is literally a textbook of how to climb the learning curve for a 5o5 crew. Any skippers out there up to the challenge?

Jesse has set the bar for 5o5 class members, dedicating a superhuman amount of time & effort into making the American Section the solid organization that it is today.

Although he is taking a well-deserved break from the 5o5 and cannot be here today, let’s have a big round of applause for Jesse.

Ted Ferrarone

I’m very proud to have commissioned this new service award bearing the name of one of our most distinguished members: Dennis Surtees’. Dennis is a legend in this class, both for his outstanding performance and for his superlative service. I’m equally proud to have Ali Meller as the first recipient. Ali has served in so many capacities for this class, most of which many of you don’t know about or may have forgotten. Ali has been fleet captain in the US for two different fleets (maybe more in Canada?). In one of these he was largely responsible for the creation of this fleet at a new club. He served as VP of the American Section, Editor of Tank Talk, VP of international (an office created for him), and is now completing his term as President of international. As webmaster, Ali took the 505 web page and made it the most informative class page on the Internet. US Sailing used our web page as an example of what a great class web page should look like. Ali was also instrumental in introducing countless people to the 505 through personal communications and through sailing time.

Ali’s leadership came along at a crucial time for the 505 class. In the early 90’s we were a class teetering precariously on the seesaw of success and failure. Our numbers in the US had steadily declined, and the class lacked direction. Ali was the catalyst for our resurgence, and a large reason why we all enjoy fine competition today.

Simply put, nobody in the world has put more into the 505 class in the past decade than Ali Meller.

Ali, on behalf of the 505 American Section, it’s my honor to present you with the Dennis Surtees Service Award for 2002.

“I nominate Bill McKinney and Stine Cacavas for the Cahn award. Bill has been with the San Diego for over ten years, and is the guy who always spends regattas in good spirit, with lots of humor, humbleness and grace. And style. After coming in from the race course early one day in Santa Cruz, while sitting in his chair, he greeted every sailor at the ramp with a cold Corona with lime. Yes, his regatta kit includes chairs, a cooler on wheels, and a cutting board. Stine has been sailing with Bill for a few years now, and while she shares Bill’s positive attitude, she also brings a new level of competition to the team. They competed in the 2010 worlds in Denmark sailing Fever Pitch, Dave Cahn’s own Lindsay. For the 2012 worlds in France they upped their game, buying a newer Waterat. I take this as a good sign that they will continue to favor us with their company for many years to come.”

Aaron Ross, USA 7156

Nominated and presented by: Mike Martin

The Dave Chan award goes out to the individual or team that expresses sportsmanship in the unique way of 505 sailing because they love 505 sailing. The award is not necessarily for the guy that wins all the races, but the guy you would most like to have a beer with at the end of the day.

These guys fit that description perfectly. They both came into the 505 picture from illustrious lead mining careers. After the first day of proper breeze in a 505 they were hooked. Since then they have enjoyed attending many of the events in northern and southern California. At the end of the day they are always thrilled with whatever they experienced and learned on the water. They are always willing to lend a helping hand despite the fact that they are usually involved in some major repair project themselves. It is always a pleasure having these guys around both on and off the water and we would all have more fun if we adopted their attitude. That is why this year the Dave Cahn award should go to Brad Wheeler and Bill Mais.

As most of you know, the Dave Cahn trophy was created in 1998, in memoriam of Dave Cahn, and his special brand of sportsmanship. Past winners have included Eric Willis/Wendy Herzburg, Barney Harris, Dan Merino/Bill Jenkins, Henry Amthor, and in 2002, Stuart Park.

Please give a big round of applause for the winner of the 2003 Dave Cahn Trophy: Paul Von Grey.

Paul’s nomination for this award was so excellent, that we will just read it to you:

“I would like to Nominate Paul Von Grey of the Pacific Northwest Fleet for the Dave Cahn Trophy. Paul has virtually single-handedly (no pun intended) been the motivation for the resurgence of the 505 fleet in Washington. He has helped push attendance at regattas from an average of three boats to a recent high of 16. He regularly rounds up sailors following races to debrief on successful and unsuccessful strategies and rigging tips. He serves as the unofficial parts warehouse for most of the sailors in Washington and probably has contributed parts, time or rigging advice to a majority of boats in Washington, Oregon, and British Columbia. He helped obtain a container of highly competitive boats that have raised the quality of racing dramatically. Whether you are a current 505 owner who needs to locate crew or a prospective 505 competitor who wants to go for a test ride, Paul is the guy who helps make the connection. He successfully poaches new 505 sailors from other fleets at regattas and every new sailor in the local fleet has probably been pointed to Paul as the guy to talk to about 505’s.

The Pacific Northwest fleet is a knowledgeable, friendly and helpful group of people and the description above could apply to every person in the fleet, however, no person embodies all of those qualities as completely as Paul.”

Let’s give another round of applause for Paul Von Grey!!

Nominated by Dave Stetson

Jesse, I wish to nominate Graham Alexander for an honorary life-membership in the class.

Graham first became a 5-oher around about 1967 and he has been one ever since. I know only a few on this side of the pond with that kind of longevity in the class. He has owned at least six boats, beginning with a 2XXX series boat; he currently owns two, a 45xx Rondar rigged to race with other classics, and Parker 7685. Not only has Graham been loyal to the class with his presence, he has been one of the class’ most ardent recruiters here in the Midwest. Within two weeks of the day I moved to Columbus in 1985, he was in my kitchen pushing me into the fray, getting me onto the boat, and helping me to find a crew slot. He has introduced dozens of people to the boat during the 17 years I have been around to watch.

In addition to recruiting, Graham has been the organizer of the class in Region 3 for as long as anyone can remember. Ki Kaiser and Graham have worked together ensuring a variety of regattas and spreading the word. He was the formal Midwest coordinator for most of the years since 1970.

Graham has been extremely generous with his time helping people to buy boats, helping them to rig them well, and helping to repair them when they broke. He has loaned his garage, his tools and equipment, his hands, and his expertise for fiberglass work, vacuum bagging, and rigging. Each winter, he has taught Sunday-evening courses on racing rules and tactics, crewing and helming skills to groups of local sailors, including newbees and hardened veterans.

Graham has been one of the true fixtures in the class and he has been one of its best public-relations specialists. Through his energy and love of the boat and the class, he has kept 505s in the Midwest and has kept Fleet 17 alive at Hoover Yacht Club. He may not be the most jolly of 505 sailors because he takes his sailing very seriously. It is integral to his core as a person and his love for the class is infectious. Because of his dedication and generosity, I believe he is as close to a life member as one could come.

Nominated by: Mike Martin and Ryan Cox Presented by: Dennis Surtees

Most of the time when we think about an award for service to a class we think about class officers or people that have volunteered their time in a very broad manner. Howard has served this way in the past by being an international class president but that is not why he deserves this award. Everyday Howard provides service to the class on a much more personal level.

The services that he provides range from straightening a mast, to loaning out his coach boat out free of charge, or letting people use his tools or even his entire garage. If you don’t know how to fix something on your 505, you need a tool or a part, who is the first person that you ask?

His services are organizational as well. Howie is always thinking of ways to better himself and always passes what he learns on to the fleet, even if it is one boat at a time. The Long Beach fleet would simply not exist without Howie. Every year howie takes the lead in organizing our weekly practices. A few years ago Team Tuesday was 1 or 2 boats, this year we often see 7 or 8.

Howie has also provided a huge service to the development of the equipment that we use today. 25 years ago he built molds and long lasting Honeycomb Kevlar boats that are still competitive today. Howies funding of the blade development program resulted in production centerboards that cost every one else much less than the developmental price that he paid.

There is no one more valuable to our fleet than Howard. So whether or not he wins this award, next time you see him, just say “Thanks Howie”!

Sailboat Keel Types: Illustrated Guide (Bilge, Fin, Full)

The keel type is one of the most important features of your boat. But the different designs can be confusing, so I've set out to create a very clear guide that will help you understand sailboat keels once and for all.

What are the most common sailboat keel types? The most common sailboat keel types are full-length keels, fin keels, bulb keels, wing keels, bilge keels, and lifting keels. Full keels are popular among cruisers, while fin keels are generally used for racing. Bilge keels and lifting keels are typically used in tidal waters, on small fishing boats for example.

In this article, we'll explore the most common keel types together. I'll use diagrams to really hit home the differences of all these keel types, and we'll discuss what keel types are best for liveaboard, ocean cruising, and lake weekend trips. After reading this article, you'll know what to choose - and why.

Sailboat Keels Explained

On this page:

Overview of sailboat keel types, keel types: fundamentals, modified full keel, centerboard.

If you just want a quick overview, here's a list with the most common keel types and a short description. More detail will follow below.

The most common keel types

• Full keels run from front to aft and are the most stable keel type, making them the most popular cruising keel.
• Fin keels offer the best performance but are less comfortable. This makes them popular for racing. Fin keels are bolted on to the hull and generally run deep and thin.
• Bulb and wing keels are both variants on the fin keel.
• Bulb keels carry additional ballast in the tip, making them more stable.
• Wing keels have two tips at the end of the keel, which reduces crossflow, improving directional stability.
• Bilge keels are double fin or double full kees, which allows the boat to be beached, making them the most popular keel for tidal waters.
• Lifting keels are moveable keels that can be lowered and raised, allowing the boat to enter shallow waters as well.
• Centerboard keels are a pivoting lifting keel, allowing to sail both coastal and inland waters.
• Leeboards are fins on the sides of flat-bottomed hulls boats, making a keel unnecessary.

Properties of each keel type

What does a keel do?

What does the keel do? A keel is a vertical blade running down from the hull. It is weighted and acts as a ballast, countering the boat's tendency to heel and preventing it from tipping over. The wetted surface under the waterline reduces slippage to leeward by creating a track, which counters the sideway force of the wind on the sails.

The reason sailboats don't tip over is that the weight of the keel counters the buoyancy of the hull, which means it will pull the boat downward. This downward force reduces heel and prevents the boat from rolling.

A canoe doesn't have a keel. Try stepping into that: it will want to roll.

It counters the horizontal force the wind puts on the sails. Whenever the force on the sails increases, the resistance of the water on the keel increases proportionally.

The heavier the keel, the less heel you'll get.

A keel reduces slippage to leeward. Slippage is simply the amount you fall off course because of the direction of the wind and current. Leeward is the side of the boat behind the wind.

So if you don't have a keel, you will fall off course quite a lot because the wind will push you over the water surface.

You will also heel quite a lot since there is nothing beneath the water surface to counter the force of the wind high up in your sails.

A keel fixes both of these issues and makes sailboats one of the most reliable boats in heavy winds and storms.

You can read on about how keels work here.

Keels can be classified by multiple dimensions. You can look at them from the side or the front. You can also classify them based on properties.

Before I dive into each keel type in-depth and show examples, let's make sure we have the same starting point.

There are essentially two sorts of keels:

Fixed keels

Movable keels.

Fixed keels are keels that are integrated into the hull or bolted on. They can't be moved or lifted.

When looking at fixed keels, you can divide them up further based on the side view. There are three main categories:

Bilge keels

Full keels are more comfortable, provide better stability and protection, but are also slower than fin keels.

Fin keels are less comfortable, provide less stability, are more vulnerable, but they're also a lot faster than full keels.

Bilge keels are double keels: one on each side of the hull. This allows them to be beached, which comes in handy in tidal waters. They are generally a lot slower and less maneuverable compared to fin keels.

Movable keels can be lifted from the water, creating a shoal (shallow) draft, allowing the boat to enter both shallow waters and coastal waters. This makes it a very versatile keel type. There are two main designs:

Lifting keels

Lifting keels can be lowered and raised through a slit in the hull. Examples of lifting keels are the daggerboard and centerboard.

Leeboards are wooden swords attached to the side of the hull and prevent slippage to leeward, but they don't stabilize the boat, nor counter heel by adding ballast.

With fin keels, there are different tip designs available. The most common two tip designs are:

These are both variants of the fin keel. Generally, these keel designs are mentioned in one breath with full keels and fin keels, creating confusion on what kind of keel they are. But it's important to understand that they are a sub-category of fin keels.

Rudder design

As with the tip of the fin, there are different rudder designs that may apply to both fin and full keels. The two most common rudder designs are:

Skeg rudder

Spade rudder.

A skeg is a structural part of the keel in front of the rudder that protects the rudder. The keel encompasses the rudder, preventing any rogue ropes, weeds, or rocks from damaging the rudder.

A spade rudder is an unprotected rudder: it doesn't have any structural protection from the keel design. It is simply attached to the hull. This design is very common.

Alright, we understand the big picture. Let's dive into more detail for each keel type and discuss the pros and cons.

Fixed keel Good for cruising and liveaboards Comfortable

What is a full keel? A full keel runs from front to aft for at least 50% of the hull and is fully integrated into the hull. It has the largest wetted surface of any keel type, and it is also the heaviest. This results in directional stability and reduced heeling, providing the most comfortable ride, but also the slowest.

The wetted surface simply means the amount of water contact area. With such a large wetted surface, it decreases slippage to leeward the most of all keel types, while it counters heeling the most as well.

The full keel is the most comfortable and stable keel type available. However, comfort comes at a price. It delivers the worst performance due to this large wetted area. It is the slowest of the keel types, and it has the worst windward performance.

This makes full keels particularly great for longtime cruisers or liveaboards who prefer comfort over speed, but less ideal for daysailers who need to navigate in and out of slips regularly.

Since it runs for at least 50% of the hull, it doesn't need to run as deep as a fin keel, resulting in a more shoal draft.

Heavier keels result in increased displacement, so a full keel boat will need a larger sail area to compensate for its weight.

For a more detailed discussion on full keel advantages, I recommend reading William's excellent article 5 Surprising Advantages of a Full Keel Sailboat here.

Example sailboats with a full keel:

• Nicholson 22
• Island Packet 380
• Beneteau Oceanis 411 Clipper
• Beneteau First 50
• Jeanneau Sun Shine 38
• Dufour 455 Grand Large

There are a lot of great cruising boats with full keel designs , some of them considered classics.

Full Keel with skeg rudder

Full keels with a skeg rudder design have a protected rudder, thanks to putting a structural part of the keel directly in front of the rudder. This helps with fending off any hazards to the rudder, like floating pieces of rope, rocks, or garbage, and protects it in case of running aground. The skeg design ensures the rudder is nearly impossible to break off.

Fixed keel Good for cruising and liveaboards Faster than a regular full keel

What is a modified full keel? A modified full keel is a full keel with a cutout at the front, reducing the wetted surface slightly, which increases performance without sacrificing too much comfort and stability. After the full keel, it has the best directional stability and the least amount of heel.

The modified full keel is popular among (bluewater) cruisers, thanks to its increased handling and performance. Most modified full keels have a skeg rudder, ensuring it is well-protected.

The slightly reduced weight and wetted surface improve windward performance quite a lot, but it is still one of the most stable keel designs out there.

Example sailboats with a modified full keel:

• Hallberg-Rassy HR 40
• Dufour Arpege 30
• Beneteau Oceanis Clipper 281
• Jeanneau Sun Odyssey 37.2

Fixed keel Good for racing Fast

What is a fin keel? A fin keel is a long, weighted blade attached to the bottom of the hull. It is lighter, faster, and more maneuverable than a full keel, but also more vulnerable. The increased distance between ballast and sails provides a lever, reducing the need for a large wetted surface or additional ballast.

Fin keels are generally bolted onto the hull and run deeper and thinner than a full keel. They are also lighter. This helps increasing performance (a lot), making fin keels a lot faster in all situations.

There are some major disadvantages to fin keels, however. Fin keels are a lot less comfortable than full keels and allow for more heel and a less solid track, so less directional stability. Fin keels are also a lot more vulnerable than full keels. They can break off when running aground, or get damaged.

They are very popular among racers and perform better when maneuvering in tight spots, like getting in and out of slips.

Example sailboats with a fin keel:

• Catalina 30
• Jeanneau Sun Odyssey 36.2

Fin keel with skeg rudder

Fin keels with a skeg rudder use a small structural part in front of the rudder to protect it. This design is mostly integrated into the hull, making it less vulnerable, and a great compromise between speed and safety.

Fin keel with spade rudder

Fin keels with a spade rudder have a completely exposed rudder, and typically a fin that is simply bolted on. The keel isn't integrated into the hull, making it more vulnerable and less comfortable.

Fin keel variant Good for cruising Less crossflow

What is a wing keel? A wing keel is a fin keel with a horizontal foil at the tip, which is wing-shaped and generally weighted. Its shape reduces crossflow, improving directional stability, and its ballast decreases heel, resulting in a more comfortable ride. The addition of a wingtip allows for a shorter fin, reducing draft.

Wing keels are good for cruising since this design improves directional stability compared to a regular fin keel or a bulb keel.

We'll discuss the wing keel's advantages and disadvantages in more detail in this article.

Fin keel variant Good for cruising Stability

What is a bulb keel? A bulb keel is a high-aspect-ratio fin keel with additional ballast at the end, which generally has a bulb or teardrop shape. This ballast improves stability and utilizes the distance between force and counterforce as a lever. This design reduces the need for a deep fin, resulting in a shoal draft.

By placing the weight at the largest possible distance from the force on the sails, you need relatively little extra weight for the same reduction in heel, making bulb keels very effective for cruising.

This design reduces the wetted area while increasing the weight of the keel just slightly, which increases sailing comfort big time.

Example sailboats with a bulb keel:

• Bavaria B/One
• Beneteau First 24

Fixed keel Good for racing Can be beached

What is a bilge keel? A bilge keel is a twin keel which uses double fins, allowing the boat to be beached and rest on its keel upright. Bilge keels have double the wetted surface, which increases comfort and directional stability while decreasing heel. Modern bilge keels often provide decent windward performance, thanks to better design.

The bilge keel does sacrifice speed compared to the fin keel but doesn't necessarily offer worse performance overall. Older designs performed considerably worse than other keels and were especially slow.

Bilge keels have some major advantages over full keels and fin keels. The most important is that the boat can be beached, making it a popular design in tidal waters. Bilge keels are especially common along the British coastline, where fishermen keep their boats in tidal harbors.

Another major advantage is that the boat can be stored resting on its keels, making dry storage and maintenance a lot easier.

Of course, there are many more pros and cons to the bilge keel , which we go into here.

Example sailboats with a bilge keel:

• Dufour Dynamique 62
• Hunter Duette
• Patagonia Patago 39
• Macwester 27

Lifting keel Good for daysailers Versatile

What is a centerboard? A centerboard is a type of retractable keel that rests on a hinge and can be lowered through a slot in the hull. It folds out like a pocket knife and allows you to increase or reduce the draft of the boat. Centerboards are mostly used on small fishing boats.

The centerboard is a very versatile keel type, allowing you to have both a very shoal draft for inland waters, as well as steadying the boat and reducing heel for larger bodies of water, or even oceans.

I've sailed a Cornish Crabber with a centerboard for a week, and while we stayed inland, having the option to increase the keel depth really came in handy when crossing the IJsselmeer (a former sea in The Netherlands).

There's more to the center

Olaf Roethele

https://www.theyachtmarket.com/en/new-boats/cornish-crabbers/adventure-17/218/

My name is Olaf and I am the owner of a Cornish Crabber 17 Adventure boat.

I would like to ask you if you can imagine to install on this boat a Torqeedo 2.0 Pod motor? Therefore i guess a modification of the keel/skeg is necessary ?!

Best regards from Uruguay,

You completely missed the hybrid planing/water-ballast keel of the Macgregor range

Thanks a lot for this explanation

Roger Bannon

Very well written article which provides an excellent guide for us small wooden boat builders. Thanks.

Leave a comment

• New Sailboats
• Sailboats 21-30ft
• Sailboats 31-35ft
• Sailboats 36-40ft
• Sailboats Over 40ft
• Sailboats Under 21feet
• used_sailboats
• Apps and Computer Programs
• Communications
• Fishfinders
• Handheld Electronics
• Plotters MFDS Rradar
• Wind, Speed & Depth Instruments
• Anchoring Mooring
• Running Rigging
• Sails Canvas
• Standing Rigging
• Diesel Engines
• Off Grid Energy
• Cleaning Waxing
• DIY Projects
• Repair, Tools & Materials
• Spare Parts
• Tools & Gadgets
• Cabin Comfort
• Ventilation
• Footwear Apparel
• Foul Weather Gear
• Mailport & PS Advisor
• Inside Practical Sailor Blog
• Activate My Web Access
• Reset Password
• Customer Service

• Free Newsletter

Ericson 41 Used Boat Review

Mason 33 Used Boat Review

Beneteau 311, Catalina 310 and Hunter 326 Used Boat Comparison

Maine Cat 41 Used Boat Review

Tips From A First “Sail” on the ICW

Tillerpilot Tips and Safety Cautions

Best Crimpers and Strippers for Fixing Marine Electrical Connectors

Thinking Through a Solar Power Installation

Getting the Most Out of Older Sails

How (Not) to Tie Your Boat to a Dock

Stopping Mainsheet Twist

Working with High-Tech Ropes

Fuel Lift Pump: Easy DIY Diesel Fuel System Diagnostic and Repair

Ensuring Safe Shorepower

Sinking? Check Your Stuffing Box

The Rain Catcher’s Guide

Boat Repairs for the Technically Illiterate

Boat Maintenance for the Technically Illiterate: Part 1

Whats the Best Way to Restore Clear Plastic Windows?

Mastering Precision Drilling: How to Use Drill Guides

Giving Bugs the Big Goodbye

Galley Gadgets for the Cruising Sailor

Those Extras you Don’t Need But Love to Have

UV Clothing: Is It Worth the Hype?

Preparing Yourself for Solo Sailing

How to Select Crew for a Passage or Delivery

Preparing A Boat to Sail Solo

On Watch: This 60-Year-Old Hinckley Pilot 35 is Also a Working…

On Watch: America’s Cup

On Watch: All Eyes on Europe Sail Racing

Dear Readers

Chafe Protection for Dock Lines

• Inside Practical Sailor

A Short List of Centerboard Cruising Boats

Being stuck on the west coast of Florida, with two shoaling channels offering the easiest access out to the Gulf of Mexico, Ive suddenly become more interested in centerboard cruisers. Generally, Im not a huge proponent of adding moving parts to a cruising sailboat, but the attraction of being able to make reasonable progress to windward, feel secure in a blow, and explore skinny-water paradises that are off limits to conventional offshore designs is hard to resist.

So this week, I started a short list of 35- to 45-foot boats that looked interesting to me. Some Ive sailed on; some I havent. Practical Sailor has reviewed several of these boats. (Ive provided links to the reviews of boats we have looked at.) Id be interested in adding to this list and hearing thoughts from other owners of centerboard cruisers.

They are listed in no particular order.

1. Krogen 38. I grew up down the street from the Krogen family on Key Biscayne and had the chance to visit Jims design studio when I was just starting out as a reporter back in the 1980s. This is a pure cruising cutter that Krogen designed for himself. It has two bronze centerboards, one in front of the other, making it very easy to balance on long passages. Pros: This is a robust, three-cabin cruising boat with a loyal following. Cons: Cored hull and teak decks on boats of this age can be landmines. Are two centerboards double trouble? 2. Morgan 41 . Ive sailed on a couple of these sloops and like the way they look and sail. The boats heritage gives it a loyal following (a good thing to look for in any used boat). Pros: Storied design, with a good deck layout and comfortable motion. Cons: Finish quality varies greatly as many were owner-completed. Factory interior is pretty basic. 3. Tartan 37 . A classic Sparkman & Stephens design. Three different couples my wife, Theresa, and I cruised in company with in the Caribbean had Tartan 37s, and all of them were happy with the boat. Pros: A very popular dual-purpose classic with good bones. Cons: A bit pricey for the size and vintage, and not as spacious as contemporary 37-footers.

4. Ovni 43. In the Pacific and Southeast Asia, we sailed with two different couples cruising aboard these aluminum boats, made popular by circumnavigator, rally organizer, and author Jimmy Cornell. Pros: Tough aluminum construction, good track record. Cons: High price, and used boats are hard to find. 5. Block Island 40. Ive never sailed on this fabled yawl designed by Bill Tripp, but PS Technical Editor Ralph Naranjo often cites it as an example of rugged construction. Pros: Proven offshore design with a cult-like following. Cons: Many of the older Block Island 40s require expensive upgrades that will quickly eat through a cruising budget. 6. Bristol 35.5 . This Ted Hood design marked Bristols push into the big-boat market under Bristols boss Clint Pearson. Pros: This is a solidly built and popular Bermuda veteran. Cons: Totally enclosed cable makes it difficult to service. Not as spacious as contemporary cruisers in this size. 7. Sabre 38 MkI or MkII. Ive sailed several Sabres, ranging from the older Roger Hewson designed 34s to the new-generation Jim Taylor boats , and have always been impressed with the way they handled. Pros: Sabres craftsmanship is generally above average for production boats. Stick-built interior is more amenable to owner conversions. Cons: Outside of the Northeast, Sabres do not carry as much value as some other brands.

I initially thought Id dig up 10 boats, but with Thanksgiving around the corner, the crush of work and family obligations, Im calling this project to a halt for now. Happy Thanksgiving! Id love to hear some other suggestions to help round out the list!

RELATED ARTICLES MORE FROM AUTHOR

On watch: this 60-year-old hinckley pilot 35 is also a working girl.

Hood Gulfstar 40

LEAVE A REPLY Cancel reply

Log in to leave a comment

Latest Videos

What’s the Best Sailboats for Beginners?

Why Does A Sailboat Keel Fall Off?

The Perfect Family Sailboat! Hunter 27-2 – Boat Review

Pettit EZ-Poxy – How to Paint a Boat

Latest sailboat review.

• Privacy Policy
• Do Not Sell My Personal Information
• Online Account Activation
• Privacy Manager

• To save this word, you'll need to log in. Log In

centerboard

Definition of centerboard

Examples of centerboard in a sentence.

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'centerboard.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

1828, in the meaning defined above

Dictionary Entries Near centerboard

center channel

Cite this Entry

“Centerboard.” Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/centerboard. Accessed 27 Aug. 2024.

Kids Definition

Kids definition of centerboard.

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Can you solve 4 words at once?

Word of the day, propinquity.

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

Plural and possessive names: a guide, 31 useful rhetorical devices, more commonly misspelled words, why does english have so many silent letters, your vs. you're: how to use them correctly, popular in wordplay, 8 words for lesser-known musical instruments, it's a scorcher words for the summer heat, 7 shakespearean insults to make life more interesting, birds say the darndest things, 10 words from taylor swift songs (merriam's version), games & quizzes.

• Dictionaries home
• American English
• Collocations
• German-English
• Grammar home
• Practical English Usage
• Learn & Practise Grammar (Beta)
• Word Lists home
• My Word Lists
• Recent additions
• Resources home
• Text Checker

Definition of centreboard noun from the Oxford Advanced Learner's Dictionary

• centreboard

Want to learn more?

Find out which words work together and produce more natural-sounding English with the Oxford Collocations Dictionary app. Try it for free as part of the Oxford Advanced Learner’s Dictionary app.

Daggerboard vs Centerboard: Choosing the Right Option for Your Sailboat

by Emma Sullivan | Aug 7, 2023 | Sailboat Maintenance

Short answer daggerboard vs centerboard:

A daggerboard is a retractable keel that can be raised or lowered vertically, providing stability and reducing sideways drift. On the other hand, a centerboard is also a retractable keel but pivots horizontally instead of vertically. While both serve similar purposes, their designs and mechanisms differ in terms of usage and effectiveness depending on the type and size of vessels they are used for.

Comparing Daggerboard vs Centerboard: What You Need to Know

Introduction:

When it comes to sailing, understanding the different types of boards used in sailboats is essential. Two commonly used boards are the daggerboard and centerboard . While both serve a similar purpose of providing stability and preventing lateral movement, there are a few key differences between these two options. So, let’s dive deeper into comparing daggerboards versus centerboards to shed some light on what you need to know.

1. Definition:

To start with, let’s define each board type. A daggerboard is a retractable keel that can be raised or lowered vertically through a slot in the hull of a sailboat. On the other hand, a centerboard is also an adjustable keel-like appendage but pivots around a single point when lifted out of the water .

2. Functionality:

The primary function of both boards is to counteract the sideways forces generated by wind acting on the sails and maintain stability in the water. However, they achieve this goal using slightly different mechanisms.

With a daggerboard, sailors have more control over adjusting its depth as it can be raised or lowered at will. This allows them to fine-tune their boat’s performance according to wind conditions and desired speed.

On the contrary, centerboards offer less adjustability and usually have set positions determined by design. Nevertheless, they still provide adequate lift and resistance against sideways drift while sailing close-hauled or upwind.

3. Performance:

When it comes to performance comparison between these two options, both have their pros and cons depending on factors such as boat size, sail plan, and intended use.

Daggerboards generally provide superior upwind performance due to their ability to be adjusted for various wind angles precisely. They allow sailors to optimize for maximum lift while minimizing drag in challenging conditions like gusty winds.

Centerboards excel in downwind sailing situations where maintaining optimal balance becomes critical. Their fixed position contributes additional stability during fast runs or when navigating waves, making them a favorable choice for racing scenarios or larger sailboats .

4. Construction and Maintenance:

Another aspect to consider is the construction and maintenance of these boards. Daggerboards are often made from materials such as fiberglass, carbon fiber, or wood laminates, requiring periodic inspection for wear and tear. However, they can be easily removed during maintenance or storage.

Centerboards are commonly built using similar materials but differ in their pivot point mechanism. The pivot offers simplicity and fewer moving parts that could potentially fail over time. Nonetheless, periodic inspections are still recommended to ensure the board remains secure within its casing.

5. Adaptability:

For sailors who enjoy exploring various water conditions, adaptability becomes a significant factor when comparing daggerboards and centerboards.

Daggerboards prove to be more versatile in this regard as their adjustability allows for experimentation with different sailing techniques on changing water types. This attribute makes them particularly suitable for sailors looking to venture into both shallow waters and deeper offshore locations while keeping their vessel stable.

Centerboards, although limited in terms of adjustability, offer reliability and ease of use across a wide range of sailing environments. They work exceptionally well for recreational sailors who primarily navigate deepwater areas without the need for frequent adjustments.

Conclusion:

In conclusion, understanding the differences between daggerboards and centerboards is crucial when considering which option best suits your sailing needs. While daggerboards provide greater performance optimization capabilities across wind angles and various conditions, centerboards offer stability and reliability in both recreational cruising and racing scenarios.

Ultimately, it’s essential to carefully evaluate your requirements based on boat type, desired performance characteristics under specific weather conditions, as well as personal preferences before making a decision between these two distinct but equally valuable options: the versatile daggerboard or steadfast centerboard.

Understanding the Difference: A Step-by-Step Guide to Daggerboards and Centerboards

If you’re passionate about sailing or have recently taken up the sport, you might have come across the terms “daggerboard” and “centerboard.” While these two components are integral to a sailboat ‘s performance, their roles and characteristics can sometimes be confusing. In this comprehensive guide, we will take you step-by-step through everything you need to know about daggerboards and centerboards – shedding light on their differences and helping you make informed decisions for your own sailing adventures.

First things first, let’s define both daggerboards and centerboards. Both of these structures are essentially appendages that extend from the hull beneath a sailboat. They serve a shared purpose: providing lateral resistance against the force of the wind, preventing the boat from being blown sideways while allowing it to move forward effectively. However, there are distinct variations in design, functionality, and usage between them.

Let’s start with daggerboards. As their name suggests, these boards resemble daggers due to their shape – long and narrow blades that slide vertically into slots in a boat’s hull. Typically located amidships or towards the stern of a vessel, daggerboards are commonly used in high-performance racing yachts or catamarans . Their primary function is to counteract the sideways force generated by wind acting on sails positioned away from where they attach to the mast – an effect known as “lee helm.” By adjusting or deploying multiple daggerboards asymmetrically, sailors can optimize their boats’ performance by minimizing drag while maximizing lift.

On the other hand, centerboards serve a similar purpose but differ significantly in design and usage compared to daggerboards. Unlike fixed daggerboads that slide vertically into slots within a hull structure permanently mounted on a boat’s keel or inside its hull at centreline position (often hollow), centerboard systems rely on pivoting mechanics and vertical movement.

To put it simply, centerboards pivot around a fulcrum or a pin attached to the hull, allowing them to be raised or lowered as needed. They are often found in sailboats designed for recreational purposes – such as small dinghies, daysailers, or even some keelboats. Centerboards can be retracted fully into the hull for shallow-water sailing and ease of launching or landing – an especially useful feature when dealing with beach landings. When lowered into position, they provide similar lateral resistance as daggerboards but typically offer less efficiency due to their simplified shape and lesser surface area.

Now that you understand the basic concepts behind daggerboards and centerboards, let’s explore their advantages and considerations. Daggerboards excel in providing substantial lateral resistance and increased lift capability due to their more refined shape and positioning options. The ability to adjust multiple daggerboards asymmetrically can lead to improved performance under varying wind conditions, making these boards indispensable for competitive sailors seeking optimal speed.

In contrast, centerboards are known for their versatility and convenience. Their pivoting mechanism enables them to be easily raised or lowered while on the water – a valuable asset when navigating shallow waters without risking damage or grounding the boat. Moreover, many small sailboats with centerboard designs also benefit from enhanced stability since the board’s weight aids in counteracting heeling forces acting on the sails.

When choosing between a daggerboard setup or a boat equipped with a centerboard system, several factors come into play. Firstly, consider your sailing intentions: are you primarily interested in casual cruising, racing competitively with precise maneuvering requirements or something in-between? Secondly, assess your local sailing conditions: do you frequently encounter challenging wind patterns or navigate areas with shallow waters ? These aspects will help steer you towards the most suitable option for your needs.

Ultimately, whether you opt for a sailboat equipped with a daggerboard system or one featuring a centerboard mechanism depends on various factors, including performance goals, sailing preferences, and intended use. Don’t hesitate to consult with experienced sailors, boat designers, or reputable manufacturers to ensure you make the right choice.

In conclusion, understanding the key differences between daggerboards and centerboards empowers sailors to select the appropriate configuration for their specific needs while navigating diverse sailing environments. Both appendages play crucial roles in enhancing sailboat stability and maneuverability, but their designs and functionalities vary significantly. Take into account your sailing aspirations and local conditions when making a decision – ensuring an enjoyable and successful experience on the water !

FAQ: Decoding the Pros and Cons of Daggerboards vs Centerboards

Title: FAQ: Decoding the Pros and Cons of Daggerboards vs Centerboards for Smooth Sailing

Introduction: Ahoy, fellow boating enthusiasts ! As you venture into the exciting world of sailing, one critical decision awaits you on your quest to harness the wind’s power. Today, we dive deep into deciphering the age-old conundrum—daggerboards or centerboards? Strap on your life vests as we embark on a journey to unravel the pros and cons of these two remarkable appendages that determine our vessel’s stability and maneuverability.

1. Understanding Daggerboards: Daggerboards, like stealthy underwater swords, elegantly slice through waters beneath our hulls. These vertically retractable boards are typically found in high-performance sailboats, optimized for speed and agility. But what makes daggerboards such an enticing choice?

Advantages of Daggerboards: a) Enhanced Speed: When engaged correctly, daggerboards create less drag compared to fixed keels or centerboards while maintaining lateral resistance. This enables your vessel to cut through water with minimal resistance, giving you a serious edge in speed races. b) Improved Upwind Performance: Daggerboards lend invaluable assistance in maximizing upwind sailing angles by resisting leeway—a fantastic asset when navigating against adverse currents or winds . c) Advanced Maneuverability: The ability to raise and lower these boards allows for easy adaptation to different sailing conditions without limiting boat movement possibilities.

Disadvantages of Daggerboards: a) Costly Investment: Opting for daggerboard-equipped vessels may lead to a higher upfront investment due to their intricate design and construction. b) Maintenance Complexities: Attending to daggerboard mechanisms demands regular inspection and occasional repairs; proper care is essential for long-term performance . c) Limited Draft Range: Some sailors argue that daggerboards hinder access to shallow waters due to their deeper draft range compared to centerboards.

2. Unveiling Centerboards’ Secrets: Now, let’s dive into the undeniable allure of centerboards—a versatile alternative that has carved its place in the sailing community. Positioned within a sailboat’s hull, these retractable appendages offer unique advantages worth considering.

Advantages of Centerboards: a) Versatility: The retractable nature of centerboards allows for easy maneuvering in shallow waters or when navigating close to shore. No more worrying about running aground! b) Cost-efficiency: Boats with centerboards tend to be more affordable compared to their daggerboard-equipped counterparts, making them an attractive choice for budget-conscious sailors . c) Simplicity in Maintenance: With fewer moving parts and mechanisms, the maintenance requirements for centerboards are often less complex and demanding.

Disadvantages of Centerboards: a) Compromised Performance: Sailing aficionados argue that centerboards might sacrifice performance compared to daggerboards due to increased drag and reduced lateral resistance. b) Limited Upwind Performance: When faced with strong winds or currents pushing against your vessel, centerboards may struggle to maintain course stability effectively.

Conclusion: Now that we’ve embarked on this quest through the pros and cons of daggerboards versus centerboards, it’s time for you to weigh your options carefully. Consider factors like your desired sailing style, local water conditions, budget constraints, and long-term maintenance commitments. Remember, whether you opt for the sleek agility of daggerboards or the versatile adaptability of centerboards—safe voyages and thrilling adventures await as you navigate through uncharted waters!

Exploring the Advantages of Daggerboards and Centerboards in Sailing

Are you an avid sailor or someone looking to dip their toes into the exhilarating world of sailing ? If so, understanding the advantages that daggerboards and centerboards provide can significantly enhance your sailing experience. These essential components are not only cleverly designed but also play a paramount role in improving a sailboat’s performance on the water . In this blog post, we will delve into the details of these devices, uncovering their remarkable benefits.

Firstly, let’s start by demystifying what daggerboards and centerboards actually are. Both of these apparatuses serve the same purpose – they stabilize a sailboat by providing lateral resistance, preventing it from drifting sideways due to wind pressure. However, they accomplish this task through different mechanisms.

Daggerboards are retractable foils that typically slide vertically from within the hull. These appendages are often found on high-performance racing boats as they offer numerous advantages. One notable advantage is their ability to maximize speed by minimizing hydrodynamic drag. When deployed correctly, daggerboards reduce sideways drift and lift the boat out of the water slightly, reducing wetted surface area and frictional resistance – resulting in enhanced speed through the water .

Additionally, daggerboards have another trick up their sleeve – adjustable angle-of-attack. Sailors can fine-tune these boards to suit different wind conditions, allowing for optimal performance based on variable factors such as wind strength or direction. This adaptability ensures that you are always at an advantage when facing changing weather conditions during races or leisurely sails.

On the other side of things, centerboards – unlike daggerboards – pivot horizontally from within the hull towards the boat’s midline. Although they lack some of the advantages provided by daggerboards regarding drag reduction and adjustment capabilities, centerboards excel in versatility and accessibility.

One significant advantage that centerboards offer is their ability to navigate shallow waters easily. You’ll find these boats cruising close to shorelines and in areas where draft limitations exist, such as lakes, rivers, or even windy coastal havens with numerous sandbanks. The retractable nature of centerboards allows sailors to raise them fully when entering shallow waters, minimizing the risk of grounding the boat while still maintaining excellent balance and control .

Furthermore, the positioning of a centerboard closer to the boat’s center of mass assists in preventing excessive heeling (tilting) during sailing . For those new to sailing or those who prefer a more stable ride, this can provide a greater sense of safety and security on the water.

In conclusion, both daggerboards and centerboards bring distinct advantages to sailboat enthusiasts. Daggerboards offer improved hydrodynamics for speed enthusiasts while providing adjustability for varying wind conditions – perfect for competitive racing or achieving top-notch performance. On the other hand, centerboards excel in versatility by allowing sailors access to shallow waters without sacrificing stability.

Whether you’re aiming for podium finishes in a regatta or simply seeking an invigorating recreational experience on the water, having a good understanding of these vital components will undoubtedly elevate your sailing adventures . So next time you hoist those sails and feel the saltwater spray on your face, appreciate how these cleverly designed daggerboards and centerboards optimize your vessel’s performance, granting you unparalleled control and enjoyment throughout every voyage.

How to Choose Between a Daggerboard and a Centerboard for Your Sailboat

Choosing the right type of board for your sailboat is a crucial decision that can greatly impact your sailing experience. Two popular options are the daggerboard and the centerboard , each with its own unique advantages and considerations. In this blog post, we will delve into the intricacies of these two board types to help you make an informed choice for your vessel.

Let’s start by understanding what a daggerboard and a centerboard actually are. Both are vertical boards positioned in the keel to provide stability and prevent sideways drift. The primary difference lies in their configuration and functionality.

1. Daggerboards: Imagine a dagger slicing through water with precision – that’s precisely how daggerboards operate! These long, narrow boards are fully retractable, typically made from high-strength materials like fiberglass or carbon fiber. They offer excellent hydrodynamic efficiency, leading to enhanced upwind performance and minimizing leeway (sideways drift) during sailing .

Why opt for a daggerboard? Well, if you’re passionate about racing or want to explore faster sailing speeds, daggerboards should top your list. With their ability to be raised or lowered at will, they allow countless adjustment possibilities while on the water – from optimizing your boat ‘s balance based on wind conditions to maneuvering through shallow waters without worrying about grounding.

However, there are some drawbacks worth considering before committing to a daggerboard. Due to their intricate design and construction, they tend to be more expensive than centerboards. Additionally, retracting them may require physical effort or even hydraulic assistance on larger vessels.

2. Centerboards: Centerboards share similar functionality as daggerboards but differ in construction and operation. Unlike daggerboards that slide vertically within casing built into the hull of the sailboat, centerboards pivot horizontally from its midpoint inside the hull itself.

So why go for a centerboard instead? Primarily known for their versatility and adaptability across various boat types – dinghies, daysailers, or cruisers – centerboards provide easy access to shallow waters. As they pivot up into the hull, the sailboat’s draft decreases, allowing you to explore areas that would otherwise remain inaccessible.

If budget constraints are a concern, opting for a centerboard might be more economical compared to a daggerboard . They are generally simpler in design and easier to maintain due to their horizontal movement mechanism.

Nevertheless, keep in mind that centerboards may compromise your sailing performance slightly. Although they perform reasonably well upwind and allow sailing closer to the wind than boats without any keel at all (known as leeboards), they are not as efficient as daggerboards when it comes to performance-oriented sailing.

In conclusion, choosing between a daggerboard and a centerboard ultimately depends on your specific requirements and intended use of the sailboat. If you crave exhilarating speeds, impeccable upwind capabilities, and have room in your budget for a high-performance board, go for a daggerboard without hesitation. On the other hand, if versatility, cost-effectiveness, and shallow-water exploration take precedence over pure speed obsession, opt for a centerboard.

Remember that regardless of which board you choose; practice and experience will play crucial roles in mastering its deployment and optimizing its effect on your sailing adventures . Happy cruising!

Going Beyond Basics: Mastering the Use of Daggerboards vs Centerboards

Title: Going Beyond Basics: Mastering the Art of Daggerboards vs Centerboards

Introduction: When it comes to sailing, achieving optimum performance requires more than just a basic understanding of the equipment. To truly excel in this beautiful sport, sailors need to delve deeper into the intricacies of their vessel’s components. One such critical component is the choice between daggerboards and centerboards. In this blog post, we will explore these options in detail, shedding light on their characteristics, benefits, and how mastering their use can take your sailing skills to new heights.

The Difference Between Daggerboards and Centerboards: Before we dive into their nuances, let’s begin by understanding the fundamental difference between daggerboards and centerboards. Both are retractable fins intended to prevent leeway (sideways drift) when sailing against the wind . The primary variation lies in their location on the hull. Daggerboards are inserted vertically through slots located towards the middle of each hull side on catamarans or near the keel area on monohulls. Conversely, centerboards are mounted on pivots below the hull at its central point.

Daggerboard Dominance: 1. Performance Advantages: Daggerboards provide sailors with remarkable advantages when it comes to sailboat performance. Their vertical positioning allows for reduced drag and enhanced lift characteristics compared to centerboards. 2. Upwind Sailing Power: Due to their dynamic design, daggerboards enable better upwind sailing as they can be further extended downwards into deeper water when necessary – increasing resistance against being pushed sideways by wind pressure. 3. Higher Speed Potential: By reducing leeway during upwind maneuvers, daggerboard-equipped boats experience less resistance and consequently achieve higher speeds. 4. Enhanced Steering Control: Another noteworthy benefit of daggerboard usage is improved steering control under demanding conditions like strong winds or rough seas.

Centerboard Superiority: 1. Versatility across Depths: Compared to daggerboards that require specific water depths, centerboards allow sailors to venture into shallower waters. The ability to raise the centerboard partially or completely reduces grounding risks and grants access to areas otherwise inaccessible. 2. Simplified Maneuverability: With a fixed pivot point across all wind conditions, centerboards are more straightforward and hassle-free to operate. Their stability provides consistent performance, making sailing a breeze for beginners and less experienced crews. 3. Safety in Grounding Situations: In the unfortunate event of running aground, a centerboard is designed to kick up easily upon contact with solid objects, minimizing potential damage to both the board and the hull.

Mastering Daggerboards vs Centerboards: 1. Understanding Conditions: To make an informed choice between daggerboards and centerboards, it’s crucial to assess the predominant sailing conditions you encounter. For open-water excursions where speed reigns supreme, daggerboards are often favored. Conversely, if your voyages take you through varied depths or potentially shallow areas, a centerboard may be more advantageous. 2. Gradual Familiarization & Practice: Like any skill in sailing, mastering the use of daggerboards or centerboards necessitates practice and experimentation. Sailors who wish to truly harness these components should gradually familiarize themselves with how they influence the boat’s performance by adjusting their depth according to wind strength and direction. 3. Seek Expert Guidance: Advanced sailors seeking technical expertise can benefit from reaching out to experienced professionals or participating in sailing clinics focused on advanced techniques involving daggerboard or centerboard utilization.

Conclusion: In summary, going beyond the basics of sailing involves mastering intricate aspects such as choosing between daggerboards and centerboards. Each has unique advantages catering to different sailing scenarios and personal preferences. By honing your understanding of these components’ functionality along with practice at utilizing them optimally under varying conditions enable sailors to unlock remarkable improvements in speed, maneuverability, and control – elevating their overall proficiency in the art of sailing.

Recent Posts

• Sailboat Gear and Equipment
• Sailboat Lifestyle
• Sailboat Maintenance
• Sailboat Racing
• Sailboat Tips and Tricks
• Sailboat Types
• Sailing Adventures
• Sailing Destinations
• Sailing Safety
• Sailing Techniques

• Daily Crossword
• Word Puzzle
• Word Finder
• Word of the Day
• Synonym of the Day
• Word of the Year
• Language stories
• All featured
• Gender and sexuality
• All pop culture
• Writing hub
• Grammar essentials
• Commonly confused
• All writing tips
• Pop culture
• Writing tips

Advertisement

centreboard

/ ˈsɛntəˌbɔːd /

• a supplementary keel for a sailing vessel, which may be adjusted by raising and lowering Compare daggerboard

Example Sentences

Harvey seized the iron rod, which was fastened to the centreboard, and gave a strong pull.

It is obvious, therefore, that the shallow centreboard boat is the only type fit for Hickling.

His vessels are mostly centreboard and of light draught, the latter, by the way, being of more vital necessity than ever.

He afterwards removed the keel and returned to the centreboard, with which he thought the boat was faster and handier.

For ordinary occasions the racing centreboard was unshipped, and a smaller one substituted in its place.

Definition of 'centreboard'

Centreboard in british english.

Examples of 'centreboard' in a sentence centreboard

Trends of centreboard

View usage for: All Years Last 10 years Last 50 years Last 100 years Last 300 years

Browse alphabetically centreboard

• centre three-quarter
• centre-fire
• Centre-Val de Loire
• centreboard
• centred dot
• centredness
• All ENGLISH words that begin with 'C'

Wordle Helper

Scrabble Tools

Quick word challenge

Quiz Review

Score: 0 / 5

• Access the entire site, including the Easy Learning Grammar , and our language quizzes.
• Customize your language settings. (Unregistered users can only access the International English interface for some pages.)
• Submit new words and phrases to the dictionary.
• Benefit from an increased character limit in our Translator tool.
• Receive our weekly newsletter with the latest news, exclusive content, and offers.
• Be the first to enjoy new tools and features.
• It is easy and completely free !