foiling sailboat

12 foiling boats for sailors of all levels

• April 15, 2022
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There’s no denying that the phenomenon of the moment, when it comes to having fun, is foiling boats (as Checco Bruni told us himself in this article). In the wake of the latest editions of the America’s Cup, flying boats, especially in the dinghy segment, have become increasingly widespread. On one or two hulls, with one or more foils, more or less easy to fly, single or crewed.

We have selected for you 12 flying boats with which to enter the world of foils or with which to try and perfect your skills. We also tell you how much they cost and the “difficulty of flight” (XXX: difficult; XX: medium; X: easy). The only common denominator is that they are great fun!

Birdyfish – 4,7 m – For foiling beginners

Flying difficulty:   X

The ideal boat for learning to sail foils, even for beginners. Very few trim adjustments for foils allow you to enjoy all the excitement and joy of flying. The crew will only have to deal with sail trimming. The appendages with a soft-angled L guarantee take-off from 10 knots of wind. The shape of the bow works well even in waves. Price: 16,980 euros.

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Flo1 – 4.25 m

Flying difficulty:  X

An interesting single to approach and perfect in the world of small foilers before moving on to more sophisticated craft. Produced by the Dutch company Aeronamics, it has a soft, almost C-shaped foil. There is no adjustment of the rake of the appendages but only its extension in the water, which makes the “trim” of these appendages easy and intuitive after just a few trips. Top speeds are around 20 knots. Price: 15,495 euros.

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NACRA F20 – 6,20 m – Like America’s Cup cats

Flying difficulty:  XXX

The Nacra yard, which specializes in open catamarans and produces the Nacra 17 Olympic class, has fitted its F 20 model with a “Flight Control System” to make it fly. The Nacra 20 FCS was designed by Pete Melvin and Gino Morelli, the authors of the 2013 America’s Cup rulebook, and its foils are reminiscent of those on the AC72 in San Francisco. A very physical boat and not for everyone. Price: 34,000 euro.

Foiling Dinghy – 3,86 m – Small and versatile

It weighs 30 kilos and can be foiled as early as seven knots of wind. The Foiling Dinghy is equipped with an inverted T rudder and a pair of curved foils that act as both lifting and straightening foils, with an automatic management system. The foils have a few simple adjustments depending on what you want to achieve (more flying or more straightening). Price: 15,500 euros including taxes.

Moth – 3,35 m – The foiling cult dinghy

The progenitor of the flying dinghies is still one of the most complete single foilers on the market today. Suitable mainly for advanced sailors who already have experience on foils, it has appendages that offer multiple setting options and the possibility of being changed according to wind strength. The international class is one of the most active and always organizes very crowded races. Cult product. Price: from 20,000 euros.

Peacoq 14 – 4.70 m – Like a flying Fireball

Flying difficulty:  XX

With a hull that is vaguely reminiscent of the old Fireballs with a “cut” bow, the Peacoq 14, an evolution of the Club version, is a dinghy that can be a compromise for both novice and experienced foil sailors. In fact, the dinghies can be operated in automatic trim, or more experienced sailors can adjust their angle for maximum performance. Price: quote on request.

Persico 69F – 6,9 m – The trendy boat

This concept boat is the brainchild of the Italian racing elite (Giorgio Benussi, Dede de Luca, “l’oriundo” Maciel Cicchetti) and was designed by Argentineans Wilson and Marquinez. Flying the 69F is not too difficult, although it does require a good physique and strength in the arms, especially for the mainsail trimmer and the foil adjuster. The racing circuit has now been launched with an attractive programme. Price: rented by the season.

Skeeta – 3,35 m – Easy for anyone

Ease first. The idea behind Skeeta is the same as that of many other small foilers: to make this type of wing easy and open to everyone. Skeeta is a single glider that flies on two self-regulating appendages, not particularly technical to fly but still very high performance, with the particular shape of the hull that distinguishes all Quant models. Price: 15,345 euros.

Stunt S9 – 4,16 m – The Italian Foiling cat

This is an all-Italian One Design catamaran that can be sailed as a single with just a mainsail or even a jib depending on the weather conditions. Like other catamarans, to improve stability in flight, it moves on four submerged appendages. Physically it requires a certain amount of athleticism, also because there is a trapeze, but with a little training it can be suitable for a wide audience. Price: 16,600 euros.

Ufo – 3,00 m – Flying with two hulls

This small catamaran is equipped with a sensor that self-adjusts the inclination of the single central foil, coupled to the T of the rudder. It can take off even in light winds thanks to the lightness of its construction. The cat is quite easy to sail, suitable even for sailors who do not have much experience with foils.

The official european dealer for Foiling UFO is  Sea-Change . Price:  8.980 euros + VAT

Waszp – 3,35 m – For the whole family

Very similar to the Moth, but with one big difference: the Waszp is a monotype, it is not made of carbon and the appendages being monotyped cannot be changed. For this reason it is less expensive than the Moth, even if it does perform somewhat less well. It is considered by many to be an ideal “family” boat because it is fun for both young and old. The foil adjustment system is managed by a sensor, but it is possible to set the appendages and modify some adjustments. Price: 12,200 euros.

Whisper – 5,40 m – Full performance

As light as the highest performing Cats, it features a one-piece, non-removable platform that provides great structural rigidity. Equipped with the four classic self-adjusting appendages, it is able to set sail in light breezes with a certain ease. It is a double, with trapeze, mainsail, jib and gennaker, fast even in light winds. Physically demanding. Price: 26,900 euros.

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Boat of the Year 2020 F101: Best Foiler

• By Dave Reed
• Updated: December 10, 2019

At A Glance

Price As Sailed: $24,750

Design Purpose: Learn to foil, advance skills

Crew List: One or two

Rob Andrews and his ­business partner Alan Hillman have been teaching foiling for a few years now, and one thing they’ve learned is we get better by sailing, not by swimming. Thus was the genesis of the F101, a craft with which they could teach the fundamentals of foiling—without the crash and burn. But it’s not just a learn-to-foil boat, either. It’s a platform with which new and experienced converts alike can take their ­foiling skill set to a higher level.

The key to mastering the F101, Andrews explains, is grasping righting moment. With the trimaran platform, you get plenty of it, as well as a stable boat that’s more forgiving than any other small foiler. “The trimaran configuration gives you righting moment direct from the foil in the middle hull,” he says, “and gives a measure of safety. It’s hard to capsize the boat.”

The judges learn as much when it comes time to sail the F101. In 15 knots and more, and a steep Chesapeake chop, Powlison is first to give it a go. He settles into the boat, gets his bearings, perches skittishly on the weather hull, sheets on the mainsail (no need to use the boat’s gennaker above 12 knots) and off he goes like a bat out of hell, popping up on the foils without even trying.

“The trick is getting used to the sensation of heeling to windward,” he says. “It takes a bit of trust. Once foiling, it’s quiet and fast, and I felt like I had to be really active on the mainsheet to keep it on the foils.”

That’s true of any foiler, but the beauty of the F101, the judges agree, is when you do lose it, it’s no big deal. The boat drops off its foils, the bows auger in and you get a face full of water; but just reset, bear away and try again.

“The hull shape picks up the buoyancy gently,” Stewart says, “which makes it depress smoothly and prevents it from pitchpoling. When I dumped it a few times I thought I was going in, but not a chance. You quickly realize there’s plenty of floatation there to save you. In flat water, with one day of training you’d get up to speed quickly.”

When teaching people to foil, Hillman starts with “skimming,” a ride height barely above the surface. As the sailor becomes more accustomed to how the boat behaves, there’s a simple line adjustment at the foil head: Dial it up one setting and increase your ride height.

As you’re sailing, the foil wand hanging behind the trailing edge effectively feels where the boat is riding relative to the water and actuates the main flap. In light winds, it gives you more lift, and the boat pops up on the foil. Get too high, and the wand drops down even ­further, forcing negative lift on the flap, which brings you back down to your desired height and prevents the foils from breaking the surface.

In terms of construction, the judges praise its carbon-and-epoxy build quality and the all-up weight of 180 pounds, which makes it easy to get to and from the water. With the F101 sitting on its dolly in the boat park, going sailing is as simple as pulling back the covers, hoisting the main and launching from a dock, beach or boat ramp with minimal fuss.

“What I like about it is that it’s one of those boats that you buy and don’t need to add anything to it,” Allen says. “There’s ­nothing to change out or upgrade.”

For simplicity, the boat is set up with adjustments that let you ratchet up the experience as you climb the learning curve. On the rudder foil, for example, there is a clear numbering system so that as you twist the tiller extension, you change the rudder rake. The baseline setting is zero, and it’s the same for the main foil. The only thing left is to balance the forces with the mainsheet.

“When I first got up on the foils, I was thinking to myself, ‘This is too easy; I should be working harder,’ ” Powlison says. “As they said, this boat solves a lot of the problems associated with other foiling dinghies. It’s a great high-performance boat that represents the next step in making foiling accessible to the public.”

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Easy to sail, yet incredibly fast!

Skeeta is the most versatile foiler on the market. Fast, stable and easy to sail in displacement mode, as well as high-performance foiler with exceptional speed!

Easy to launch, quick and simple to rig from out of the box, so you can get to the water quicker than ever before!

Specifications

Innovative Foil Design

Fully articulating balanced lifting foil design dramatically reduces the risk of “foiling crashes”, making foiling much easier and safer.

Very low drag and always in laminal flow means speed and efficiency.

Full Control

Fully height-adjustable wand control, by increasing or reducing the foiling ride-height to the desired level on-the-fly. This allows the boat to immediately and safely return to displacement mode in the event of unforeseen weather conditions.  

Easy Launching

Fully retractable Daggerboard and Rudder Verticals, and clip on lifting foils that allow you to launch straight from the trolley. No need to tip the boat over.

Sail is quickly hoisted and dropped with a halyard, even on the water.

Timeless Design

The iconic scow shape has been optimized for maximum hull speed to get you up and foiling, but also a very fast boat to sail.

The low deck height makes it incredibly easy for people of all ages to be able to get on board quickly and safely. 

Click, Click

Skeeta comes pre-assembled and clips together super quickly. Rig up in less than 15 minutes and get on the water!

Robust & Durable

Made from foam, fibreglass and carbon fibre. The hull is unsinkable and durable.

Sailing Versatility

Sailors have the option of flying high or riding low in displacement mode. All Skeeta’s come with inserts that clip into the vertical foils to use for displacement sailing.

Ultimate Rig Control

State of the art high-performance, over-rotating rig accompanied with a vang track. The over-rotation delivers power and efficiency, whilst the vang track provides the ability to achieve the ultimate control for leech tension required for foiling.

​Two-piece carbon fibre mast features a halyard designed specifically to make rigging and de-rigging easy on shore or the water. 

The mast bases are of different lengths to suit the sail sizes, and all tips and bases are easily interchangeable. 

Fully adjustable spreaders are standard, allowing sailors of different weights to be competitive in the same class.

Which Skeeta sail is right for you?

This chart is only an indication of what is best for an average sailor in flat water conditions. More experienced sailors may choose to use larger rigs in windier conditions.

3 different rig sizes available for all sailor weights and conditions: 7.2m², 8.5m² and 9.5m²

Enhance your foiling

In partnership with Stoke, we’ve created the world first boost assisted foiling dinghy!

• Take off in as little as 4 knots of wind
• Enhanced maneuverability for marinas and tight spaces
• Easy to use wireless controller with configurable safety lock
• Safely return to shore when the wind drops
• Provides over 40 boosts
• Optional e-Daptor to attach onto the rudderbox

*Stoke Foil Boost and e-Daptor purchased seperately

What do you get?

• Skeeta – fully assembled ready to sail
• Fully assembled Wings 
• Choice of 7.2, 8.5 or 9.5 rig
• Two-piece carbon fibre mast
• Fully adjustable spreaders
• Carbon fibre boom
• Daggerboard, Rudder and Lifting Foils
• Displacement foil insert tip
• Rudderbox assembly with tiller extension
• Padded bags for mast, foils and spreader
• Aluminium collapsible Trolley
• Transport box

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“iFLY15 is the unique combination of high performance with easy accessibility – for maximum performance and maximum fun.”

Cec catamarans -ifly15 team, “we love speed while keeping control – high speed needs to be controllable. the flying boat of the future, is a stable foiling sport catamaran.”, cec catamarans – ifly15 team, „ foiling: one of the things you have to experience to really feel it. “, jimmy spithill, skipper oracle team usa, “stable flight is the key to high performance sailing”, “ifly15 – get the balance right between a nice sporting challenge and a reasonable and controllable level – enjoy the exhilaration, the speed and the adrenaline in your veins, but always stay master of the situation “, “stable flight attitude is the most important prerequisite for high performance sailing.”, victor diaz de leon, sailgp team usa, “stable flight attitude is key for easy foiling. ifly15 with superior flight stability delivers immediate flying fun within the first minutes. advantage through high-tech.”, “the ifly15 is the quickest boat around the course, … “, arno terra – sailor, ifly 15 one design and ifly razzor pro, the  performance  foiling  catamaran, for maximum speed and maximum control.

• Easy access to a high HIGH PERFORMANCE FOILING CATAMARAN
• Automated DYNAMIC FLIGHT Assistance SYSTEM – FLYSAFE® FOIL CONTROL
• highest quality standards – High-tech full carbon sailboat
• completely modular – fully customizable
• adjustable rake – MAIN FOIL DIFFERENTIAL during sailing for even more performance in the version IFLY Razzor Pro
• Foiling Versatility and Speed …

The quality and performance have been proven for 8 years and further developed to maximum perfection in every detail

IFLY HYDROFOIL SAILING – EXCELLENCE, FIELD PROVEN TO PERFECTION

Racing     and     more   …..

 Have a high performance racing machine on regattas

  single handed or double Foiling

  crew weight up to 180 kg

  Racing and fun:

  Sail with Family & friends

in any sailing condition:

  Full foiling – upwind and downwind

  Waves and Flat waters

  Light and strong winds

  early take off

  Foiling maneuvers

Transport and Facilities

  Easily transportable on a road trailer

  Slipped with a conventional beach trolley

  ready to sail in 20 minutes

  iFLY15 is designed to sail on the sea and lakes

Stay tuned for foiling events and specials!

Flysafe® Flight assistance

Main foil differential technology – mdt, innovative, sophisticated foil control for unbeaten performance, high speeds and easy access, ifly15 and ifly razzor pro, ifly main foil differential – mdt, ifly razzor pro.

early take off in lightest breeze

F oiling maneuvers are heavily supported, superior flight attitude through active foil control, dynamic control of f light high , pitch and role, non-linear control and feedback control system for best flight stability, even in waves, the foils do not need to be manually manipulated, optimized performance: advanced sailors can adjust rake and gearing, more about flysafe®>>>, active flight assistance, the foil can be trimmed actively while sailing, the key to maximum performance , mdt for performance-orientated pro sailor, mdt extends the flysafe® foil control, to sail large xxl rigs, more about main foil differential ->>>, performance downwind: staying on the foils, full foiling, in 5-6kts tws, reaching max. boat speeds of up to 2.5*tws, performance upwind: full foiling from 8kts. tws, taking off from 7kts tws, video youtube channel, ifly15 foiling catamaran.

The most innovative development in foiling technology

About ifly15, stable flight  is  key for both: first for highest performance and foiling in a wide wind range, including rough and wavy conditions, but also easy access into foiling…...

iFLY stands for uniqueness in design and function. Its superior Flysafe ® active foil control system autonomously supports the stable horizontal flight position in the longitudinal and lateral direction. The 4 T-Foils do not have to be operated by the sailor during sailing.

Average skilled dinghy or catamaran sailors with some trapeze experience can safely foil with the iFLY15 after only a few hours. Quick access – the immediate sensation of success – steep learning curve. In the hand of an experienced sailor, iFLY15 offers a whole new sailing experience with previously not experienced speeds and agile maneuverability.

The flight control system, combined with numerous fine-tuned innovations , ensures safe foiling even in strong winds and rough seas.. Stable flight attitude allows pushing hard, so in good conditions, iFLY reaches high boat speed beyond 30 knots in a controllable way.

IFLY15 offers freedom to fly alone or in pairs. Due to the exclusive use of high-tech materials , iFLY15 is extremely rigid and weighs less than 90 kilos ready to sail. With its low weight and its state-of-the-art hydrofoils, it is airborne in winds as low as 2Bft. / 6 Knots.

iFLY15 has a length of only 15 feet, is easy to transport, quick to get ready to sail, and can be easily slipped from the beach using a conventional beach trolley.

Its sophisticated design reflects the highest demands on quality and function.

iFLY15 – customer reviews

 « LESS CRASHING IS MORE FUN »

MARCUS LYNCH, PROFESSIONAL SAILOR AND OLYMPIC COACH, GC32 OMAN, NACRA17

« I WAS INITIALLY AMAZED AT HOW EASY TO HANDLE THE IFLY IS AND AT HOW IDLE THE BOAT IS EVEN IN STRONG WINDS. »

ANTOINE, IFLY OWNER FROM GENEVA

VERY STABLE, EXTRAORDINARY STABLE. IT IS EXTREMELY INTERESTING, BECAUSE YOU IMMEDIATELY SEE THE ACCESSIBILITY OF THE BOAT.

FRANÇOIS GABART

« GREAT BOAT, LIKE A MOTH ON STEROIDS ! »

VICTOR DIAZ DE LEON, MIAMI, PROFESSIONAL SAILOR. US TEAM SAILGP, INTERNATIONAL MOTH, MATCHRACING MELGES 32, J70

WHAT A GREAT BOAT THIS IS, AND I ABSOLUTELY LOVE IT”

PHILIP WALKER

« THE DYNAMIC FLIGHT CONTROL SYSTEM ALLOWS LONG AND STABLE FLIGHTS »

GERHARD FLORIN, IFLY OWNER FROM GENEVA, SWITZERLAND

TO FELLOW SAILORS WHO LOVE THE THRILL OF SAILING WITH SPEED WHILE MAINTAINING CONTROL”

ROY BALLENTINE

« WELL BALANCED AND RAKE DIFFERENTIAL ALLOWING FOR GREAT PERFORMANCE UPWIND! »

CARLOS ROBLES,PROFESSIONAL SAILOR 49ER, PALMA DE MALLORCA

« A SENSATIONAL FOILING EXPERIENCE. THE SPEED IS IMPRESSIVE »

INGMAR WARNICKE: COMMODORE OF YCSO, YACHT CLUB SCHARBEUTZ, BALTIC SEA

⭐ ⭐   ⭐   ⭐   ⭐

IFLY RAZZOR PRO – THE NEW IFLY FOR EXPERIENCED SAILORS

THE SINCE 7 YEARS PROVEN IFLY15 WITH FLYSAFE® DYNMAMIC FOIL CONTROL has now a pur Racing fellow: THE iFLY RAZZOR Pro. THE iFLY racing VERSION ENABLES EVEN HIGHER PERFORMANCE, to sail in extremely tough conditions and allows sailing with XXL rigs. THE MAIN DIFFERENCE BETWEEN THE IFLY15 ONE DESIGN AND THE IFLY RAZZOR PRO IS A BIGGER RACING RIG, SPECIAL FOILS AND THE MAIN FOIL DIFFERENTIAL (MDT), WHICH IS MANUALLY TRIMMED BY THE SAILOR. THE MDT IS WORKING HAND IN HAND WITH THE FLYSAFE® DYNAMIC FOIL CONTROL SYSTEM.

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Performance Sailing – Sail GP News: Racing on the Edge – T-Foil proves to be the winning design

Regatta and foiling News: Long distance Race – Duc d’Albe 2023 – Club Multicoques Hyères – sailing Race @iFLY Razzor Pro

iFLY Main Foil Differential Technology – MDT Foil Control – high Performance sailing

IFLY FOILING Adventure

FOILING – REGATTA – EVENTS

Long distance Race – Duc d’Albe 2021 – Club Multicoques Hyères – sailing Race @iFLY Razzor Pro

INTERNATIONAL IFLY foiling FLEET RACE 2021

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[2023] Hydrofoil Catamaran: The Ultimate Guide to Foiling on Water

• November 1, 2023
• Hydrofoil Basics

Experience the thrill of flying above the water with a hydrofoil catamaran!

Are you ready to take your hydrofoil boarding to the next level? Look no further than the hydrofoil catamaran. In this comprehensive guide, we’ll dive deep into the world of hydrofoil catamarans, exploring their history, how they work, their benefits and drawbacks, and everything else you need to know to make an informed decision. So, buckle up and get ready to soar above the waves!

Table of Contents

Quick answer, quick tips and facts, how does a hydrofoil catamaran work, benefits of hydrofoil catamarans, drawbacks of hydrofoil catamarans, choosing the right hydrofoil catamaran, maintenance and care, recommended links, reference links.

A hydrofoil catamaran is a type of watercraft that combines the stability of a catamaran with the lift and speed of hydrofoils. It uses specially designed foils to lift the hulls out of the water, reducing drag and allowing for faster and smoother sailing. Hydrofoil catamarans are popular among sailors and water sports enthusiasts for their incredible speed, maneuverability, and thrilling foiling experience.

Shopping Links: Hydrofoil Catamarans on Amazon | Hydrofoil Catamarans on Walmart | Hydrofoil Catamarans on Etsy

• Hydrofoil catamarans can reach speeds of up to 40 knots (46 mph) or more, depending on the design and conditions.
• The foils on a hydrofoil catamaran can lift the hulls out of the water, reducing drag and allowing for a smoother and faster ride.
• Hydrofoil catamarans are used for various purposes, including racing, recreational sailing, and even transportation.
• Foiling on a hydrofoil catamaran requires some skill and practice, but it’s an exhilarating experience once you get the hang of it.
• Hydrofoil catamarans come in different sizes and designs, catering to different skill levels and preferences.

Hydrofoil catamarans have a fascinating history that dates back to the early 20th century. The concept of using hydrofoils to lift boats out of the water and reduce drag was first explored by Italian engineer Enrico Forlanini in the late 1800s. However, it wasn’t until the 1950s that hydrofoil technology started to gain traction in the boating world.

The first hydrofoil catamaran, known as the “Aquavion,” was developed by the French engineer René Guilbaud in the 1950s. This innovative design combined the stability of a catamaran with the lift of hydrofoils, revolutionizing the world of sailing. Since then, hydrofoil catamarans have evolved and become more advanced, offering incredible speed, maneuverability, and stability on the water.

A hydrofoil catamaran works by utilizing hydrofoils, which are wing-like structures mounted underneath the hulls of the boat. These foils generate lift as the boat gains speed, lifting the hulls out of the water and reducing drag. This lift allows the hydrofoil catamaran to achieve higher speeds and a smoother ride compared to traditional boats.

The hydrofoils on a catamaran are typically designed with a curved shape, similar to an airplane wing. This shape creates a pressure difference between the upper and lower surfaces of the foil, generating lift. The foils are usually adjustable, allowing the sailor to fine-tune the performance of the catamaran based on the sailing conditions.

To control the hydrofoil catamaran, sailors use a combination of steering and sail trim. By adjusting the angle of the foils and the sails, they can optimize the lift and balance of the boat, ensuring a stable and efficient ride. It takes some practice to master the art of foiling on a hydrofoil catamaran, but the rewards are well worth the effort.

Hydrofoil catamarans offer a range of benefits that make them a popular choice among sailors and water sports enthusiasts. Here are some of the key advantages of hydrofoil catamarans:

Speed : Hydrofoil catamarans are known for their incredible speed. By lifting the hulls out of the water, hydrofoils reduce drag and allow the boat to glide smoothly above the waves. This enables hydrofoil catamarans to reach impressive speeds, making them a thrilling choice for racing and high-performance sailing.

Maneuverability : The lift generated by hydrofoils enhances the maneuverability of catamarans. With reduced drag, hydrofoil catamarans can make sharp turns and quick maneuvers with ease. This agility is particularly useful in racing scenarios, where every second counts.

Stability : The dual-hull design of catamarans provides inherent stability, even at high speeds. When combined with hydrofoils, the stability of hydrofoil catamarans is further enhanced. This stability makes them suitable for sailors of all skill levels, from beginners to experienced professionals.

Efficiency : Hydrofoil catamarans are more efficient than traditional boats. By reducing drag, hydrofoils allow the boat to sail faster while using less power. This increased efficiency translates to longer sailing distances and reduced fuel consumption, making hydrofoil catamarans an environmentally friendly choice.

Versatility : Hydrofoil catamarans are versatile watercraft that can be used for various purposes. Whether you’re looking for a high-performance racing catamaran or a recreational sailboat for family outings, there’s a hydrofoil catamaran to suit your needs. Some models even offer the option to switch between foiling and non-foiling modes, providing flexibility on the water.

While hydrofoil catamarans offer numerous benefits, it’s important to consider their drawbacks as well. Here are a few potential downsides to keep in mind:

Cost : Hydrofoil catamarans tend to be more expensive than traditional boats. The advanced technology and materials used in their construction contribute to the higher price tag. Additionally, maintenance and repairs can also be costly, especially if specialized parts or services are required.

Learning Curve : Foiling on a hydrofoil catamaran requires some skill and practice. It can take time to learn how to control the boat effectively and maintain stability while flying above the water. Beginners may find the learning curve steep, but with dedication and proper instruction, anyone can master the art of hydrofoil catamaran sailing.

Weather Conditions : Hydrofoil catamarans are sensitive to weather conditions. While they excel in flat water and moderate winds, rough seas and strong gusts can pose challenges. It’s important to be aware of the weather forecast and choose suitable sailing conditions to ensure a safe and enjoyable experience.

Transportation and Storage : Hydrofoil catamarans can be larger and bulkier than traditional boats, making transportation and storage more challenging. Specialized trailers or racks may be required to transport the catamaran, and adequate storage space is needed to protect it when not in use.

Despite these drawbacks, the thrill and excitement of foiling on a hydrofoil catamaran outweigh the challenges for many sailing enthusiasts.

When it comes to choosing the right hydrofoil catamaran, there are several factors to consider. Here are some key points to keep in mind:

Skill Level : Consider your skill level and experience as a sailor. Some hydrofoil catamarans are designed for advanced sailors, while others are more beginner-friendly. Choose a catamaran that matches your skill level to ensure a safe and enjoyable sailing experience.

Intended Use : Determine how you plan to use the hydrofoil catamaran. Are you looking for a racing catamaran, a recreational sailboat, or something in between? Different models offer varying features and performance characteristics, so it’s essential to choose a catamaran that aligns with your intended use.

Budget : Set a budget for your hydrofoil catamaran purchase. Prices can vary significantly depending on the brand, model, and features. Consider both the upfront cost and the long-term maintenance expenses when determining your budget.

Brand and Reputation : Research different brands and their reputation in the hydrofoil catamaran industry. Look for brands with a track record of producing high-quality, reliable catamarans. Reading customer reviews and seeking recommendations from experienced sailors can also provide valuable insights.

Demo and Test Sails : Whenever possible, try out different hydrofoil catamarans before making a final decision. Many manufacturers and dealers offer demo and test sails, allowing you to experience the performance and handling of the catamaran firsthand. This hands-on experience can help you make an informed choice.

Remember, choosing the right hydrofoil catamaran is a personal decision that depends on your individual preferences and needs. Take your time, do your research, and consult with experts to find the perfect catamaran for your hydrofoil adventures.

Proper maintenance and care are essential to keep your hydrofoil catamaran in top shape and ensure its longevity. Here are some maintenance tips to help you keep your catamaran performing at its best:

Rinse with Fresh Water : After each sailing session, rinse your hydrofoil catamaran with fresh water to remove salt and debris. Pay special attention to the foils, as saltwater can cause corrosion over time.

Inspect for Damage : Regularly inspect your catamaran for any signs of damage or wear. Check the foils, hulls, rigging, and sails for any cracks, dents, or loose fittings. Address any issues promptly to prevent further damage.

Store Properly : When not in use, store your hydrofoil catamaran in a dry and secure location. If possible, keep it covered to protect it from the elements. Consider using a boat cover or storing it in a boat shed or garage.

Follow Manufacturer’s Guidelines : Follow the manufacturer’s guidelines for maintenance and care. Each catamaran may have specific recommendations for cleaning, lubrication, and other maintenance tasks. Adhering to these guidelines will help prolong the life of your catamaran.

Seek Professional Assistance : If you’re unsure about any maintenance tasks or need assistance, don’t hesitate to seek professional help. Local boatyards, sailing clubs, or authorized dealers can provide expert advice and services to keep your catamaran in optimal condition.

By following these maintenance tips and caring for your hydrofoil catamaran, you can enjoy many years of thrilling foiling adventures on the water.

How fast is the hydrofoil catamaran?

Hydrofoil catamarans can reach impressive speeds, depending on various factors such as the design, wind conditions, and skill of the sailor. Some high-performance hydrofoil catamarans can exceed 40 knots (46 mph) or more. However, the exact speed will vary based on these factors.

How does a foil catamaran work?

A foil catamaran, also known as a hydrofoil catamaran, works by utilizing hydrofoils to lift the hulls out of the water. These foils generate lift as the boat gains speed, reducing drag and allowing for faster and smoother sailing. The lift created by the foils enables the catamaran to “fly” above the water, resulting in increased speed and improved performance.

What happened to hydrofoils?

Hydrofoils have a rich history and have been used in various applications, including passenger ferries, military vessels, and recreational boats. While hydrofoils experienced a surge in popularity in the mid-20th century, their use declined in some sectors due to factors such as high costs, maintenance challenges, and the development of alternative technologies. However, hydrofoils continue to be used in niche markets, including high-performance sailing and racing.

Read more about “… What is the World’s Largest Hydrofoil Boat?”

Are hydrofoil boats more efficient?

Yes, hydrofoil boats are generally more efficient than traditional boats. By lifting the hulls out of the water, hydrofoils reduce drag and allow the boat to sail faster while using less power. This increased efficiency translates to longer sailing distances and reduced fuel consumption. However, it’s important to note that the efficiency gains may vary depending on factors such as the design, sailing conditions, and skill of the sailor.

Hydrofoil catamarans offer an exhilarating and thrilling experience on the water. With their incredible speed, maneuverability, and stability, they have become a favorite among sailors and water sports enthusiasts. While they may come with a higher price tag and require some skill to master, the rewards of foiling on a hydrofoil catamaran are well worth it.

When choosing a hydrofoil catamaran, consider factors such as your skill level, intended use, budget, and the reputation of the brand. Take the time to research and test different models to find the perfect catamaran for your needs.

So, are you ready to take flight on a hydrofoil catamaran? Embrace the thrill, experience the freedom, and enjoy the incredible sensation of soaring above the water. Happy foiling!

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Leaders in their respective fields, the team's expertise ranges from technology and electronics to fashion, luxury goods, outdoor and sports equipment, and even food and beverages. Their years of dedication and acute understanding of their sectors have given them an uncanny ability to discern the most subtle nuances of product design, functionality, and overall quality.

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WHAT IS IT?

The UFO is a simplistic modern hydrofoiling boat, that allows anyone to fly through the air, freeing the hull from draggy water. More stable than the International Moth -or even a child’s pram- with a simple rig, and a set of fully retractable hydrofoils, all for $11,500 USD the UFO makes flying attainable. Thousands less than it’s nearest competition.  Built in the United States in high volume and quality control, the UFO maintains a one-design philosophy, creating close and exciting racing on foils!

FLY WITH THE UFO

• Designed and built in the USA
• $11,500 USD
• Compatible and rewarding to all skill levels
• Lightweight for easy maneuverability
• Solid, nearly dent-proof, hull
• Unique patented hull and rig designs
• Stable on and above the water
• Small footprint for carefree storage and shipping
• Takeoff from about 8knts of wind
• Fast, fun, easy to control foiling

FUN FOR ALL AGES

The wand system controlling the foils, which can be set to fly very high, very low (even ‘no fly mode’) and all points in between. This means you can progressively add challenges to your UFO experience as you feel ready for them, from ‘beginner mode’ all the way to ‘extreme mode’. Additionally, the highly tunable sail can be set up to provide only the amount of power that your body type needs, and no excess. This means that the UFO is accessible and fun for sailors of all sizes, ages and skill levels. Merely set up the boat for your skill level and body type and go play around.

The UFO is very broadly applicable and has flown payloads from 70 pounds -a tiny kid- to 270 pounds -a tall grown man and a teenage boy-. The foil package just needs power to climb. Ultra light sailors have been caught on camera flying in 5 knots of breeze and the baseline for 225 pound sailors to take off is 10 knots. 270 flies in 12 knots of breeze.

SETUP AND BREAKDOWN

While the boat can be left on shore with everything in place, but the sail down, that doesn’t mean the UFO isn’t easy to put together or take apart. Quite the opposite. Simplicity begets simplicity and the boat is a cinch to put together and take apart.

MANAGEABILITY

Being small is it’s own reward when it comes to handling the boat through all sailing experiences. When you start to really push yourself learning to foil, there are good odds you’ll manage to capsize it. The UFO is easy to right from capsizes and even full “turtle” inversions. This last part is critical, because when catamarans are too heavy to right from turtle the only option is to make the mast float. This has the unintended downside of making the boat very likely to blow away from you. The UFO is designed to stay right alongside you in the event you are separated from the boat. Additionally, the boat possesses an uncommon “park” mode in which it will hold station of its own accord, apparently indefinitely without external input of any kind. The full benefits of that upside have not begun to be fully exploited.

FOILING AT ALL POINT OF SAIL

The Fulcrum design team strictly adhered to the axion “if there’s a point of sail (say, upwind or downwind) that it can’t always foil on, you can’t call it a foiler”. The design team achieved their goal and the UFO is a fully flying boat on all points of sail, which drastically increases its fun-factor.

At what points of sail does the UFO foil at?

The UFO fully foils at all points of sail. Upwind, downwind and reaching.  Additionally, you can set it to  not foil when you’re tired and it will do that as well, so you can get home easily. These two factors make the UFO uniquely good for learning to foil.

Who can fly the UFO?

Within reason, anyone.

UFO pilots have ranged from 8 years old to 72, from 90 pounds to 235. Young sailors do well sailing as pairs or with a middleweight to light adult. It’s rare that anyone on the fulcrum team conceives of a boat with a narrow niche in mind. Why bother? It’s a mistake in yacht design to design a boat for a narrow range of users, when for the most part people are diverse and the objective of one-design boats is to garner large fleets. That said, the boat is likely to be most satisfactory in all wind conditions in the hands of teens, small and medium men and all women. At the extreme low end of the weight range, sailors may find themselves overpowered and at the extreme high end, the wind speed required for takeoff is about two knots higher than average. UFOs have been sailed “two up” as well, though the above limits of weight range still apply to the sum of the two sailors weights.

What wind and waves can I fly a UFO in?

The UFO will sail in practically any wind condition. However, it’s important to remember that with all sailboats there are days that are great to sail in and days where you do something else.

While the UFO can at times with a skilled skipper take off in very low wind speeds, the baseline for reliable flight is around eight knots. Trying to squeeze enough power to fly out of too little wind is tiresome and in those circumstances, it’s best to do something else. In 8 knots and above, flying is magical and unforgettable. In under 8 knots, the UFO reverts to being a pleasant displacement catamaran and goes from being exciting and fast to relaxing and tactical. This is another benefit of being a catamaran.

Over the last six years the UFO has proven to be uniquely good at flying safely and consistently in very high windspeeds. In multi-class foiling regattas the UFO has proven to be the only foiler built to date that simply  loves  high windspeeds. In winds above 22 knots when other foiling boats make for shore, the UFO wants to keep playing. The upper wind limit is more a matter of taste and skill. UFOs have been sailed in 36 knots, but that requires a great deal of skill and focus.  The UFO rig having shared DNA with a windsurf rig seems to play a part in the boat’s remarkable ability to get a kick out of big wind. Since the upper wind limit on the UFO is so much higher, this makes the number of optimal days to fly a UFO (if skilled in sailing one) higher per year than with any other production foiling boat.

Most chop and wave conditions present no issue for a UFO set for the days’ conditions. After all, powered hydrofoils were first developed by various leading Navy’s as a means of smoothly flying over challenging sea-states. Choking up the ride height helps the UFO fly smoothly through the bottom of the wave pattern, undeterred. Rolling seas present even less issue, as the UFO will ride along them just like any other. Extremely tight and tall chop can be very annoying, which is not peculiar to the UFO.

Waves do effect baseline windspeeds to achieve takeoff. Imagine getting a plane to take off on a bumpy runway. This is true for all hydrofoil boats. In choppy water, ten to twelve knots can be necessary to achieve fully easy takeoffs. Some UFO sailors use aggressive kinetic techniques to overcome this and take off in choppy water and low wind.

Will I fly my first time out?

Most people do, but bear in mind that flying is a whole new experience and it takes some learning.

Conditions, setup and technique matter and if you use it incorrectly, you are likely to get some degree of incorrect results. That’s the challenge that the UFO is built to address. Over six years on the market and over 500 boats delivered, the UFO has proven to be the best and most reliable platform for ordinary sailors to reliably teach themselves foiling technique on.

What happens when I crash my UFO into something?

You’ll probably do some damage to it.

The UFO is built with durability as a core objective but it’s worth noting that the gulf between “Feather light under engineered ragged-edge high performance craft” and “literally indestructible” is extremely wide. The UFO represents neither of these extremes. Do not attempt your first flight inside a densely packed mooring field. Obstacles only make you better once you’ve mastered the basics.

How easy is it to rig a UFO?

Best in class, vs other foiling boats on the market. With that said, it’s not easier than doing nothing. Doing nothing is very easy! Putting a boat together is worthwhile but obviously involves effort.

The current cartop to launched speed record is roughly 15 minutes. Socket the mast together. Attach the boom and stays in one go. Step the rig. Flip the boat on its side, insert the foils, right the boat, hoist the sail and launch. Complexity is best avoided.

Leaving the UFO on a dock or a beach with the rig in and the foils simply in the “up” position, achieves an ease of daily use on par with any light beach cat. To go foiling all you need to do is hoist the sail with the halyard, clip the sail to the boom and attach the downhaul line and you’re ready to launch. This brings setup and breakdown to a matter of five minutes or less.

How do I launch and land a UFO?

Far far far more easily than any other foiling boat on the market.

Because the UFO is a very small catamaran, while floating the hulls float relatively deep in the water and create lateral resistance, like the hulls on a hobie 16 or hobie wave. This means that it can sail upwind without a daggerboard of any kind in the water. This is not the case with non-catamaran foilers. The rudder is outfitted with a friction brake and a down-halyard to allow its depth to vary and allow steering in shallow water. So from 16 inches of water and beyond, you can sail away from and back to shore reliably.

Because the UFO’s forward foil assembly is located  in front of  the mast, the UFO can tack and gybe while the forward foil is fully withdrawn from the water. This is unique. It allows the UFO to navigate reliably in the period between launching or landing and flying. The benefits for usability and safety cannot be overstated.

Once you’ve got to deep enough water, lower your foils fully and fly away!

That’s if you’re using a dolly.

If you aren’t using a dolly, the UFO has even more party tricks to show off. Since the foils withdraw to above the waterline of the hull, the hull can be beached or slid up onto a dock float or boat deck without any risk to damaging the foils. The UFO is a boat that’s eager to go sailing.

Can I easily cartop a UFO?

At this hull weight, the boat is very easy to put on top of a car, and its flat bottoms allow it to be strapped down hard with no drama. The other components of the boat collapse down to the point of easily fitting in a standard hatchback.

Where can I store my UFO?

Anywhere you can carry it to. Anywhere it fits.

Behind couches, under beds, under porches, in basements, inside larger boats, chained to apartment fire escapes, hanging in garages. Anywhere it can go that’s convenient for your lifestyle is a good place for it to go.

Why does X look like Y? Surely it would be better to make it like Z.

Just trust us.

If you’ve thought of it, we’ve weighed the pros and cons and its been included or excluded for good reason. Creating a boat that can be produced at an affordable price, for a wide range of sailors with a maximum quantity of accessible performance is an extremely hard target to hit. The UFO meets all of its objectives and does so by blatantly ignoring a few conventions and norms. You simply don’t make an omelet without breaking eggs.

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Foiling 101

The F101 takes you through your foiling journey, providing a progression pathway from the beginner foiler to the Olympian. F101 sets new challenges and goals at whatever level you come in, from expert to beginner.

The F101 is an all-new foiling trimaran aimed specifically at those sailors that, for whatever reason, thought foiling was too difficult for them. The concept originates from the experience of teaching many people to foil in the International Moth class and addressing the main barriers they faced. So we set about creating a new boat without the design restrictions of a box rule – in this way, foiling has been made easier.

“The boats are great fun and I was foiling after about 10 minutes on the first day and having extended periods of foiling after day 2. Not having sailed dinghies for the better part of 20 years, I never really expected to foil, so the boats are fulfilling their designed purpose beautifully. ” — Pete Selby

As an F101 owner, you get access to all of this knowledge and experience, plus access to the F101 Tribe.

The F101 Tribe is an exclusive social media channel that only owners can access, share experiences, tips, and events and generally have a fun time with foiling at the heart of the journey. It is like having a 24/7 help desk..someone, somewhere in the World, is normally awake to help!

The ethos of Foiling World and the F101 TRIBE is to:

· Sail a Fun boat

· Sail with great friends

· Sail in great locations

The F101…more than just a boat! We guarantee to get you foiling, wherever you are in the world, as remote as you like. If you buy an F101, you will FOIL! GUARANTEED!

Whatever your chosen medium, whether it’s a phone, email, text or WhatsApp, we will get back to you!

You can find our phone number and email over on the right-hand side of this page. What are you waiting for?

Few companies give you direct access to this amount of experience, not just before purchasing a boat but throughout your foiling journey.

Got a question? Looking to become an F101 Tribe member? We’d love to hear from you! Contact us .

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Foiling technology: everything you need to know about hydrofoils

Fitting foils to powerboats is all the rage, but how do they work and why is foiling back in fashion?

What is foiling?

Foiling refers to the use of hydrofoils attached to the hull of fast boats, which provides additional lift at planing speeds – often enough to lift the hull completely clear of the water.

What is the benefit of this?

Efficiency. The enemy of fast boats is the amount of effort required to push them through the water. Planing boats go some way to addressing this by rising up over their own bow wave and skimming across the surface, but the stern sections are still immersed, creating significant hydrodynamic drag. It follows that if you can lift the boat completely clear of the water, hydrodynamic drag is only acting on the foils themselves and the sterngear that propels and steers it.

Any advantages beyond efficiency?

Lifting the boat clear of the surface can reduce the disturbance of waves, smoothing the ride, but only up to a point. It’s not just about lift though – active foils can also be used to improve stability or handling and in some circumstances, can improve efficiency even without lifting the boat.

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How do foils work.

Foils work in a similar way to aircraft wings. In simple terms, as they move through the water they deflect the flow, which exerts a force on the foil. If that force is upward, the faster they move, the greater the lift.

So why are they so much smaller than aircraft wings?

Because water is much denser than air – almost 800 times, in fact. The foils have far more to push against than aircraft wings, so don’t require the same surface area.

Is this new technology?

Far from it. Foiling technology can be traced back to 1898 when Italian inventor Enrico Forlanini began work on a ‘ladder’ foil system, obtaining patents in both the UK and the USA. He had a prototype operating on Lake Maggiore soon after. British boat designer John Thornycroft followed up with a series of scale models featuring stepped hulls and a single foil, and by 1909 had a full-scale 22ft prototype running. During WWII, the German military developed a 17-tonne foiling mine layer that was tested in the Baltic at speeds of up to 47 knots. By the early 1950s, the first commercial hydrofoil ferry was running between Italy and Switzerland and a decade later, a private hydrofoil yacht featured in the Bond movie Thunderball.

Why did they never catch on in production boating?

Traditionally, high-speed hydrofoils used large V-shaped foils that jutted out beyond the boat’s beam. This made berthing tricky and increased the draught. They were also costly to construct, vulnerable to damage and difficult to power, as the propellers of conventional shaftdrives would be clear of the water once foiling. Lastly, although hydrofoils were often more efficient than monohulls, high-speed cats could usually match the efficiency without the drawbacks.

Why are they back in the news?

Foiling technology came back into public focus when the 2013 America’s Cup contenders started to use foil-shaped daggerboards to hit speeds of more than 40 knots. Ben Ainslie’s spectacular last-gasp victory for the Oracle USA team and his subsequent BAR Land Rover Cup Challenger brought foiling to a global audience. More recently, we’ve seen the emergence of several foiling motor boats, including the SEAir RIB and the Sunreef Open 40 Power. More exciting still is the news that Princess will use an advanced Active Foil System on its new R Class superboat .

What has changed?

Technology has overcome many of the shortfalls of older systems. Simon Schofield, chief technology officer at BAR Technologies, told MBY the real game changer has been the adoption of ‘Dalí’ foils. Instead of two fixed V-shape foils, Dalí foils use four independent L-shaped blades that stick out of the hull at an angle before curving up like Salvador Dalí’s famous moustache. They are far more efficient and can be retracted, solving the berthing and draught issues. In addition, computer-controlled active systems allow the foils to be adjusted to suit speed and sea conditions. This doesn’t just improve efficiency, it can enhance the ride and handling too. When cornering, for example, a traditional hydrofoil boat doesn’t lean into the turn, making it uncomfortable for passengers. An active system can adjust each foil to induce the correct degree of lean. Modern materials also reduce drag and cavitation.

How about propulsion?

The Enata Foiler uses twin BMW diesel 320hp engines, but instead of being connected to the propellers with hefty drag-inducing shafts and gearboxes, these generate electric power which can be sent down a thin flexible cable to slender electric motors mounted on the retractable rear foils.

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Published on June 2nd, 2017 | by Assoc Editor

Foiling and Foil Shapes, a Beginner’s Guide

Published on June 2nd, 2017 by Assoc Editor -->

by Mark Chisnell, Land Rover BAR The rules covering the design and construction of the team’s America’s Cup Class (ACC) boat have defined many of the parts of the boat, including the hull and crossbeams (together called the platform), and the wing shape and size. What’s left for the team’s designers and engineers to work on is principally the daggerboards and rudders, and the control systems that operate them along with the wingsail.

A lot of the technology that goes into the control systems is hidden well inside the hull, with just glimpses of the HMI (human machine interface) that the sailors use to control the board rake, wing trim and so on. The foils are on full view however, so we thought a beginners guide to ACC foil design would come in useful now the racing is approaching.

Basic Principles The foils use exactly the same scientific principles as an aircraft wing. Just as an aircraft wing will lift a plane up off the ground, the foils of an America’s Cup Class boat will lift it out of the water. Wings are foils too, called aerofoils because they work in air. The foils on the new America’s Cup boats are more accurately called hydrofoils, because they work in water.

The secret to both types of foil is the shape – aerofoils and hydrofoils use a special shape to guide the wind or water around them, and generate the lifting force to get planes and boats up in the air. Of course, the America’s Cup boats also use an aerofoil. The main wingsail works exactly the same way as an aircraft wing, it’s just rotated to stand up straight, rather than lie flat.

While an aircraft needs an engine to push the air over the wing fast enough to generate enough force to lift the aircraft up off the ground, the wingsail on the Cup boat generates force from the wind blowing past it. The harder the wind blows, the more force it makes to push the boat forward. When the boat is going fast enough, the hydrofoils will then be able to create enough force to lift the boat out of the water. This reduces resistance to the forward motion and the boat goes faster still.

There are four hydrofoils on the boat — we count the rudders at the back because they have small wings at the tips called elevators. However, the real power to keep the boat in the air comes from the hydrofoils (the daggerboards, as you will often hear them called by the sailors) and we will concentrate on these.

The L-Foil The L-foil is exactly that; a vertical daggerboard shaft that goes through the hull of the boat, with a single horizontal hydrofoil on the bottom, the whole thing shaped like an ‘L’. If nothing else changes, then the L-foil keeps generating lift as the boat goes faster and so the boat keeps rising, and as it rises, less and less of the daggerboard is in the water.

At the basic level, two things then happen: firstly, the boat starts to slip sideways because there is less of the vertical part of the daggerboard in the water and this makes the boat feel unstable and hard to steer. Then, ultimately, if the boat keeps rising the horizontal part of the board that is doing all the lifting will break the surface. If it does, there will be a catastrophic loss of lift and the boat will come crashing back down.

Aircraft use moving parts on the foils to control the amount of lift – trailing edge flaps — but the rules forbid these on the ACC boats, so to maintain stable flight the sailors change the rake or angle of attack of the whole dagger board (and hence the foil) to the water.

Rake If you rake the board backwards as the boat accelerates, the lift will reduce and the boat will come to an equilibrium at a steady height above the water. This is all well and good until the conditions change, maybe the wind speed goes up or down, or the boat hits some waves. When that happens the rake will need further adjustment to find the new equilibrium… until the next puff or lull when it must change again.

In the big breeze and rough water of San Francisco Bay in the 34th America’s Cup it turned out that these moments of equilibrium didn’t last very long and on occasions barely existed at all. The crew’s ability to generate the hydraulic power to change the board and wing trim was simply overwhelmed; they couldn’t achieve stable flight.

V-foil The solution was what’s called the V-foil, in which the horizontal part of the ‘L’ is angled upwards to form more of a ‘V’ shape (the angle at the bottom of the ‘V’ is called the dihedral – a dihedral of 90 degrees would define an L-foil, less than that is progressively more of a V-foil).

The V-foil uses the same principle as one of the most successful original foiling powerboats. The grand old man of 19th century innovation, Alexander Graham Bell put a couple of 350hp engines on the back of what was called HD-4 and set a new marine world speed record in 1919 of just over 70mph.

HD-4 used three ‘ladders’ of small foils, one at the front, and one each side close to the back. When the boat accelerated it started to lift out of the water, and as it lifted, one by one the ‘rungs’ of the foils would break clear of the water. As they did so the lift would decrease, and unless the boat continued to accelerate the boat would stop rising and settle at an equilibrium.

The V-foil achieves this same effect with a single foil and is used in the commercial application of fast ferries— one runs between Southampton and Cowes on the Isle of Wight, right across the Solent waters where the team train, and has done so (on and off) since 1969 – so V-foils are well understood.

When a boat equipped with a V-foil keeps rising as more lift is generated by faster speeds, both parts of the ‘V’ come out of the water together. Critically, when the ‘horizontal’ section starts to break the surface at the tip, it has the effect of reducing the lift gradually, because it doesn’t all come out of the water together. So the boat comes back down gently, working towards an equilibrium ‘ride height’ of its own accord.

It might be that it doesn’t reach this equilibrium before something else changes, but the V-foil has some inherent stability (unlike the L-foil) that doesn’t require human intervention. The shape provides a feedback mechanism to control the amount of lift and produce a more stable ride at a consistent height above the water. The downside of the V-foil is that it will generate less lift and more drag than the L-foil under the same conditions, because some of the lift generated is pushing sideways rather than up.

So one of the big questions facing the teams at the outset of this campaign was whether or not the sailors could achieve stable flight with an L-foil in the new boats and the new venue. Bermuda was a very different place to San Francisco; the winds were expected to be lighter, the water flatter and it seemed that stable flight should be easier to achieve with an L-foil under human control.

A huge amount of work has gone into foil and control system design and we now know that the answer is yes, they can – all the teams are using L-foils, often with unloaded dihedral angles of greater than 90 degrees. These angles close as the boat sails and the foil is loaded up to become much closer to, or 90 degrees.

Cant Another buzz word for the 35th America’s Cup is the cant. The cant of the board is similar to the rake, except that the bottom of the board is moving sideways across the boat, to and from the centreline, rather than backwards and forwards. When the board is canted outwards (towards the edge of the boat) it creates greater ‘righting moment’ and more power to drive the boat forwards.

Righting Moment When the wind hits a sail it creates the force to move the boat forward but it also creates a force that is trying to tip the boat over. If you have ever seen a dinghy or yacht knocked flat by a big gust of wind then you’ve already got the idea.

It’s considerably simplified, but essentially the more force that can be applied to resist the wind’s effort to tip the boat over, then the faster the boat will go, because more of the wind’s energy can be captured and applied to forward motion. The resisting force is called the righting moment and creating as much righting moment as possible is a fundamental principle of designing fast sailboats. It’s the reason that you see people leaning over the windward side when they are racing, putting bodies as far out on the windward side as possible is creating righting moment.

S-Foil Finally, there’s the question of whether the vertical part of the daggerboard should be straight or ‘S’ shaped. The curve of the S-foil could be used — like the cant — to move the bottom of the board outboard and increase the righting moment. So S-foils are more powerful, but they are also more difficult to use. The curves have to raised up and down through the bearings and internal mechanisms in the hull, and that means a lot of work to keep the friction down and the efficiency high.

Tags: AC35 , America's Cup , foiling , Land Rover BAR , Mark Chisnell

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Monofoil: The pocket rocket that can foil in just 8 knots of breeze

• Matthew Sheahan
• October 1, 2019

Built and developed in secret, the 8m Monofoil is a super-fast one-off foiling monohull, originally designed as a lake racer

The spectacle of a flying catamaran, be it an Olympic Nacra 17, a GC32, the recent America’s Cup 50-footers, or anything in between, has become almost normal in today’s racing world, so rapid has the shift to foiling been among multihulls.

But, even 17 years after they first appeared, the sight of a diminutive foiling Moth still turns heads. Foilers don’t have to be big to be impressive, balancing a single hull on a single foil is enough. Like those who can ride a unicycle, there’s something awe-inspiring about watching sailors who have pitch perfect balance fly a twitchy monohull while making it look like the most natural thing in the world.

There have been plenty of attempts to bring monohull foiling to bigger boats and to the masses. Yet no one has yet cracked the code, at least not for production boats.

Little surprise then, that whenever a new monohull foiler comes onto the scene it attracts plenty of attention. One of the latest is the 8m Swiss-built Monofoil. This extraordinary and complex looking boat is essentially a sportsboat with an open cockpit but with outrigger foils, like bicycle stabilisers, that generate righting moment by pushing upwards on the leeward side.

She was designed by Swiss match racing sailor Eric Monnin and built by Damian Weiss, both of whom shared a common goal: to create a fast foiling monohull for the European lakes.

Interestingly, neither had any desire to create a production version, nor tell the world that this was the answer for others. Instead, they simply wanted to find out if they could fly fast enough on one hull to stand a chance of winning some of the big prizes at Europe’s top lake races, including the famous Bol D’Or Mirabaud.

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Launched in the spring of 2018 after two years of secret development, the initial signs looked good as the 8m sportsboat delivered an impressive opening performance, topping 25 knots on one of her first outings.

After a winter of tweaking and refining, where the team had increased the foils by 20% and reduced her overall weight by 50kg, the Monofoil was back afloat for this season. Shortly after her re-launch at Easter, it was clear that the team had raised the game.

“We can now foil upwind in just 8 knots of breeze,” said Monnin. “And when the breeze builds to 12 knots we are travelling at 16-20 knots at a true wind angle of around 50-60°. When it comes to downwind performance we can happily sit at 22 knots in 12 knots of wind with the gennaker. After that, when the breeze is up to 15-20 we are holding 24-27 knots with just the main and jib,” he continued.

The carbon bowsprit is 1.2m long and cants so the tack of the gennaker can be set further to windward, allowing the Monofoil to sail deeper

All impressive stuff for an 8m monohull. This is a proper pocket rocket that weighs just 650kg and can be rigged off the road trailer and launched in a couple of hours. Indeed, Monnin explains, her performance was in part limited by the need to keep the maximum beam down to 2.5m to meet European towing regulations.

Single hull foiling

So how does the Monofoil work? Setting the foils to one side to start with, the 8m long sportsboat flies a self-tacking jib upwind and a gennaker off a canting bowsprit downwind. She is designed to be raced by a full crew of four, including the helmsman, with two on trapezes to boost the righting moment.

She has a large square-topped mainsail that makes full use of the available space in a sail plan that sees the boom extend all the way to the transom where a full width traveller allows plenty of mainsheet tension to keep the head of the main stand up. This does mean she has a pair of running backstays rather than a single fixed stay, but double aft swept spreaders provide sufficient fore and aft support for the mast.

The foil deployed, but in the raised position. Normally it wouldn’t be underwater but the boat was heeled at the dock

Being a potent performer, she sails at high apparent wind speeds with the apparent wind ahead of the beam. This makes the full width mainsheet traveller an important feature to allow the mainsail to be dropped down to leeward while still maintaining leech tension, much like a multihull.

Her rudder is mounted on a transom-hung gantry to ensure greater efficiency for the T-foil blade. The rake of the rudder can be adjusted to alter the fore and aft trim of the boat.

While the foils look large and complex, their operation is surprisingly simple and belie the amount of work that has gone into designing a complete system that allows the curved foils to slide through a set of bearings in the hull.

A simple rope-driven worm drive alters the rake of the T-foil rudder, which in turn alters the trim of the boat. The rudder is mounted on a gantry off the transom to minimise cavitation

Much like the Beneteau Figaro 3, the idea is that both boards are lowered when sailing. Yet unlike the Figaro, the windward board is lifted partially to help raise it above the water’s surface and reduce the chances of it becoming immersed where it would create drag.

The clever part is the small amount of movement that is required to lift and lower the boards, especially when compared to the amount of movement required to raise and lower daggerboards on a modern multihull.

Also unlike the Figaro, the Monofoil’s boards are fully retracted in light winds. With very little of the foil in the water there is minimal drag and the boat can be sailed like any other monohull.

A custom bearing lets the daggerboard slide vertically to be raised or lowered. Rake is adjusted by the green line winding a worm drive

In these conditions the skinny and efficient 2.2m deep keel, with its 160kg bulb, is a good combination when the breeze is below 8 knots and allows the Monofoil to perform like any other similarly sized sportsboat.

The dihedral (upwards angle) of the foils is also an interesting feature that provides a degree of automatic heel control. As the boat accelerates and comes upright, so less of the foil is in the water, which reduces vertical lift.

Deceptively simple

At rest this boat does look pretty complex, yet once she’s rigged and underway you realise how simple she is to operate as well as how much effort has gone into designing her that way.

Below decks the full carbon construction is clear to see

This is an ingenious trailer-sailer that will fly in light conditions and be stable on foils right up through the wind range, something the crew demonstrated during this year’s Mirabaud Bol d’Or. As a vicious 50-plus knot storm swept through the fleet, she and her crew were one of the few to survive unscathed and go on to complete the overnight race.

The irony remains that – unlike many others in the Bol d’Or – this is not a boat that was intended to be the prototype for a new range of production foilers, even though she appears to provide answers to plenty of questions.

The bottom line is that the Monofoil seems to work. Irrespective of what speeds she clocks up, what is most impressive is how she performs across such a wide range of wind speeds.

Rectangular cut-outs in the hull allow the foil to be lowered completely on the leeward side. The windward foil is raised slightly in a similar way to pulling up a normal daggerboard

The Monofoil is no one-trick pony and while the concept wasn’t created for production, it could provide an appealing route for those who are realistic about their ability to learn how to balance like a Moth sailor, or ride a unicycle.

Specification

LOA: 8.0m (26ft 3in) Beam: 2.5m (8ft 2in) Displacement (empty): 850kg (1,874lb) Mast height: 12.2m (40ft 0in) Mainsail area: 32m 2 (345ft 2 ) Headsail area: 16m 2 (172ft 2 ) Gennaker area: 50m 2 (538ft 2 )

TF10 Foiling Trimaran

Ultra-modern, morrelli & melvin design, craftsmanship, wij bouwen uw nieuwe foiling boot, the tf10 trimaran: the foiling flying machine.

After the foiling revolution, the TF10 foiling trimaran is now the evolution of foiling sailing. With the TF10 foiling trimaran, sailing and foiling can be reached by any sailor. The TF10 is an 11 m long one-design foiling trimaran, designed by the famous yacht designers Morrelli & Melvin . The TF10 is built and sold by DNA Performance Sailing.

The TF10 is suitable for a crew of 4-5 persons and can handle a wide range of sailing conditions. The construction consists of pre-preg carbon fibers with a Nomex honeycomb core. This provides a lightweight, yet safe and robust construction. The foiling TF10 trimaran is the perfect foiling boat for both pleasure trips and sailing fast in races.

The transport of the TF10 is also revolutionary: when folded, it is easy to transport. We supply the TF10 with a specially designed road trailer, launching by boat ramp or crane are both possible.

Foils create sailing comfort

Thanks to the sophisticated design, every sailor feels comfortable on the TF10 foiling trimaran. Regardless of age, gender or muscle strength. And regardless of the speed, which can quickly reach up to 30 knots! Safety and comfort were the two main focuses of the design. This is reflected in a number of elements:

• The bow is designed to cut through the waves. This results in less hits on waves, which greatly increases sailing comfort.
• The carbon benches with back support provide a comfortable seat for crew and helmsman.
• The wishbone boom (half windsurfer boom) provides the decksweeper mainsail layout to perform at its best. An additional advantage is that in a manoeuvre the sail is now the lowest point and not the carbon boom.
• A ‘Semi-ridged’ carbon fibre trampoline cloth has been specially designed to make the boat’s construction torsional stiff. It makes it easier to walk on and block’s splashing water from the foils.
• The TF10’s foils and T-rudders minimize pitch and roll movements. The rake angle of all four foils is adjusted with electric actuators. This system improves comfort and safety during sailing and foiling.

TF10 hydrofoils

The TF10 foiling trimaran flies with a 4-point foil setup:

• The T-rudders with horizontal elevators generate lift and/or downforce.
• The so called Z-type daggerboard foils provide the necessary lift to be able to foil.
• The advantage of the 4-point-foil setup is that the crew does not have to pick up the daggerboards during manoeuvres. This significantly reduces the crew’s actions.
• In addition, we have electric actuators that change the position of the foils and rudders with a single push on the button.
• The design of the Z-foils has already been very successfully applied to other foiling multihulls, such as the A-cats and the Olympic Nacra 17.

Specifications

Length incl. bowsprit: 10.94 m Length waterline: 9.97 m Beam: 6.8 m Beam incl. benches: 7.65 m Beam (folded on trailer): 2.5 m Minimum draft: 0.4 m Maximum draft: 2.55 m Height center hull: 1.78 m Mast length: 16.1 m Displacement leightship: 1400 kg Displacement max. load: 1900 kg Outboard engine: 6pk, retractable Mainsail: North Sails 3Di 45 m2 Jib: North Sails 3Di 28 m2 Gennaker: (on furler) 71 m2 LED Navigation lights

Fast and pure one-design racing Easy shipping Created by owners for owners

See and feel the future of sailing. The TF10 foiling trimaran is here!

This special foiling trimaran was designed at the end of 2015. The idea was to make a foiling multihull that anybody can sail and foil with. A foiling boat equipped with the same technology as the boats at the America’s Cup.

The TF10 and its sailing class is the result of initiatives by a group of five sailing friends on the East Coast of America (Newport, RI). They have joined forces and created the TF10 sailing class.

The members of the TF10 Class Association have lot’s of experience in various one-design racing series. The goal is to create a racing series that is as exciting, honest and fun as the boat itself.

Morrelli & Melvin designed a trimaran to combine the specific characteristics of a trimaran with foiling. The trimaran’s center hull offers important advantages here: its buoyancy and pitch stability eliminate the risk of ‘nose diving’ or ‘pitch poling’. In the design briefing, wind range and sea state (short sea shipping) were important. The design of the TF10 is based on this.

For all information, competitions and the latest news, please visit the TF10 Class website: www.TF10class.com

It is possible to make a trial run with the TF10. We do this on the IJsselmeer, just a few kilometres from DNA’s shipyard. Here the sailing and foiling conditions are perfect: There is always wind and you can fully enjoy the beautiful surroundings. The IJsselmeer lies between the cities of Lelystad, Almere and Enkhuizen. The new island area “Markerwadden” can also be seen and possibly visited here. Mail us at [email protected]

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Candela to deliver 8 electric foiling ferries to saudi arabia’s neom.

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With its largest order to date in the serial production of electric foiling vessels, Swedish ... [+] boatmaker Candela will deliver eight electric foiling ferries to Saudi Arabia's NEOM sustainable development along the Red Sea Coast.

Swedish boatmaker Candela is disrupting the ferry boat experience with its 12 passenger electric foiling ferry. Candela has agreed to provide the initial order of eight electric foiling ferries for the service network of the massive Saudi Arabian Red Sea Project NEOM . The boat was chosen for its advantages in speed, endurance, efficiency, sustainability, and a smooth, quiet ride.

Candela's model P-12 electric foiling ferries prove the perfect complement to the 10,270 square mile (26,500 square kilometer) development at NEOM, a zero-carbon, circular economy gigaproject on the Red Sea coast. The development, part of a larger collection of the Saudi Arabian Public Investment Fund's Saudi Vision 2030 undertaking, embraces sustainability throughout its master plan.

The Candela P-12 measures 40 feet (12 meters) in length with a 15 foot (4.5 meter) beam and can carry up to 30 seated passengers. It has a top speed of 30 knots and a 50 nautical mile range at 25 knots.

The interior of the Candela P-12 electric foiling ferry can be configured in a number of ways, from ... [+] regular seating to a luxurious lounge, accommodating a wide range of uses.

Candela's Unique Approach

Many companies put forth prototypes of foiling vessels, but Candela stands alone in the successful serial production of electric hydrofoil vessels delivered to customers, 70 and counting in the two generations of C-7 and C-8 models. Today, they are the only company in the world to undertake serial production of an electric foiling ferry, the P-12.

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Candela has undertaken the design and manufacture of all critical components in-house. The carbon fiber hulls, foils, and decks, along with the computers that run the flight systems, software like the user interface, and the C-POD motors used for propulsion are all produced by Candela, optimizing the process and assuring quality control.

The single critical component they do not make is the Polestar battery. The safety standards held by the automotive industry and the proven energy density allow Candela to scale production effectively using this proven technology.

The Candela C-POD Streamlined Motor

The patent Candela C-POD streamlined direct drive motors with contra-rotating propellers was ... [+] designed to operate under water. No gears, no transmission, no noise.

The Candela P-12 has low maintenance costs due to fewer moving parts, yielding a 3,000 hour service life for the Candela C-POD. The craft emits 97.5 percent less CO2 during its lifetime when compared to a similar sized conventional diesel vessel, according to a life cycle analysis performed by the KTH Royal Institute of Technology in Stockholm.

The design of the optimized power train results in a super compact, super efficient motor, according to Claes Bonde, Candela Senior Mechanical Engineer. The propulsion system places one motor in front and one aft, driving two propellers, contra-rotating for efficiency.

Everything has been made as simple and as streamlined as possible, reducing the size of both the motors and propellers. Speeds of both the motor and props are optimized, reducing tip speed in relation to rotational speed. That enables the C-POD to deliver the smallest, most efficient units that stay below the limit of cavitation even at high rotational speeds.

Tomas Löfwall, Senior Electrical Powertrain Engineer emphasizes that the motors are very robust with reduced complexity. The motors are passively cooled by seawater on the outer housing, requiring no gears and no oil. "Brilliant design is about reducing complexity," Löfwall says, "And this is what we have done."

Flight Controller Stabilization

Sensors along the perimeter of the ferry measure wave height, roll, and pitch data, sending information to the computer with adjustments made up to 100 times each minute. The result is a smooth ride, flying above the waterline, quietly and quickly.

The Candela P-12 electric foiling ferry can be configured to client needs, offering an efficient, ... [+] quiet, low maintenance method of water transit.

Candela foiling ferries use a computer-guided system to fly above the water, making up to 100 adjustments per second, working to remove friction from the hull/water interface. The Candela P-12 uses 80 percent less energy than conventional vessels with a speed of 25 knots and a duration of two hours of operation, earning it the distinction as the fastest electric passenger ship with the longest range.

"The P-12 is designed to create zero-emission water transport systems which have significant improvements over traditional water commuting” says Gustav Hasselskog, CEO and founder of Candela. Further, Hallselskog explains, "Unlike legacy systems with large, slow, and energy-inefficient conventional ferries, the Candela P-12 is a smaller and faster unit, allowing much more frequent departures and quicker journeys for passengers. All daily necessities and services will be just a short boat commute away.”

The Candela electric foiling ferry alongside the Candela C-8 electric hydrofoil leisure boat, both ... [+] offer smooth, efficient, quiet flights across the water. The C-8 can travel at 22 knots for 60 miles on a single charge.

Focused on improving current transit modes, Hasselskog states, "Our hydrofoil technology unlocks the potential of waterways, offering quicker, more comfortable, and cheaper journeys, reducing road congestion from Stockholm to New York to Bangkok."

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At Candela, we make hydrofoiling electric boats and ferries that are the first to combine long range with high speed. Our innovative hydrofoil technology cuts energy use by 80%, creating silent, fast, zero-emission vessels with unmatched efficiency. Simply put, we’re revolutionizing sustainable water travel.

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We aim to transition to fossil fuel-free transport with superior efficiency and environmental benefits. Traditional ferries are polluting, costly, and slow. Our hydrofoil technology unlocks the potential of waterways, offering quicker, more comfortable, and cheaper journeys, reducing road congestion from Stockholm to New York to Bangkok. Gustav Hasselskog Founder / CEO at Candela

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