sigma 400 sailboat

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• Sailboat Guide

Sigma 400 is a 40 ′ 3 ″ / 12.3 m monohull sailboat designed by Rob Humphreys and built by Marine Projects Ltd starting in 1990.

Rig and Sails

Auxilary power, accomodations, calculations.

The theoretical maximum speed that a displacement hull can move efficiently through the water is determined by it's waterline length and displacement. It may be unable to reach this speed if the boat is underpowered or heavily loaded, though it may exceed this speed given enough power. Read more.

Classic hull speed formula:

Hull Speed = 1.34 x √LWL

Max Speed/Length ratio = 8.26 ÷ Displacement/Length ratio .311 Hull Speed = Max Speed/Length ratio x √LWL

Sail Area / Displacement Ratio

A measure of the power of the sails relative to the weight of the boat. The higher the number, the higher the performance, but the harder the boat will be to handle. This ratio is a "non-dimensional" value that facilitates comparisons between boats of different types and sizes. Read more.

SA/D = SA ÷ (D ÷ 64) 2/3

• SA : Sail area in square feet, derived by adding the mainsail area to 100% of the foretriangle area (the lateral area above the deck between the mast and the forestay).
• D : Displacement in pounds.

Ballast / Displacement Ratio

A measure of the stability of a boat's hull that suggests how well a monohull will stand up to its sails. The ballast displacement ratio indicates how much of the weight of a boat is placed for maximum stability against capsizing and is an indicator of stiffness and resistance to capsize.

Ballast / Displacement * 100

Displacement / Length Ratio

A measure of the weight of the boat relative to it's length at the waterline. The higher a boat’s D/L ratio, the more easily it will carry a load and the more comfortable its motion will be. The lower a boat's ratio is, the less power it takes to drive the boat to its nominal hull speed or beyond. Read more.

D/L = (D ÷ 2240) ÷ (0.01 x LWL)³

• D: Displacement of the boat in pounds.
• LWL: Waterline length in feet

Comfort Ratio

This ratio assess how quickly and abruptly a boat’s hull reacts to waves in a significant seaway, these being the elements of a boat’s motion most likely to cause seasickness. Read more.

Comfort ratio = D ÷ (.65 x (.7 LWL + .3 LOA) x Beam 1.33 )

• D: Displacement of the boat in pounds
• LOA: Length overall in feet
• Beam: Width of boat at the widest point in feet

Capsize Screening Formula

This formula attempts to indicate whether a given boat might be too wide and light to readily right itself after being overturned in extreme conditions. Read more.

CSV = Beam ÷ ³√(D / 64)

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The Sigma 400 is a 40.27ft masthead sloop designed by Rob Humphreys and built in fiberglass by Marine Projects since 1990.

The Sigma 400 is a moderate weight sailboat which is a good performer. It is stable / stiff and has a good righting capability if capsized. It is best suited as a coastal cruiser.

Sigma 400 for sale elsewhere on the web:

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Review of Sigma 400

Basic specs..

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

The boat equipped with a masthead rig. The advantage of a masthead rig is its simplicity and the fact that a given sail area - compared with a fractional rig - can be carried lower and thus with less heeling moment.

The Sigma 400 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.

The keel is made of lead. Compared with iron, lead has the advantage of being 44% heavier, which allows a smaller keel and hence less water resistance and higher speed.

The boat can only enter major marinas as the draft is about 2.28 - 2.38 meter (7.48 - 7.78 ft) dependent on the load. See immersion rate below.

The boat is typically equipped with an inboard Perkins Prima diesel engine at 34 hp (25 kW).

Sailing characteristics

This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 7.7 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.

The immersion rate is defined as the weight required to sink the boat a certain level. The immersion rate for Sigma 400 is about 261 kg/cm, alternatively 1466 lbs/inch. Meaning: if you load 261 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 1466 lbs cargo on the boat it will sink 1 inch.

Sailing statistics

This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 47m 2 (505 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

Are your sails worn out? You might find your next sail here: Sails for Sale

If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

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Sigma 400 - Sailboat Data, Parts & Rigging

Sailboat data, rig dimensions and recommended sail areas for Sigma 400 sailboat. Tech info about rigging, halyards, sheets, mainsail covers and more.

Sailboat Data directory for over 8,000 sailboat designs and manufacturers. Direct access to halyards lengths, recommended sail areas, mainsail cover styles, standing rigging fittings, and lots more for all cruising and racing sailboats.

MAURIPRO Sailing offers a full range of sailboat and sailing information to help you find the correct sailboat part, one that properly would fit your sailboat and sailing style. Our sailor's and sailboat owner support team are ready to talk with you about your specific sailing needs, coming regatta, or next sailing adventure.

From all at MAURIPRO, let's Go Sailing!

Copyright © 2024 MAURIPRO Sailing LLC.

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• Boat REF#  ·  155537
• Length  ·  12.17m
• Year  ·  1993
• Construction  ·  GRP
• Underwater profile  ·  Fin
• Sleeping berths  ·  8
• Engine  ·  1 x diesel 34hp, Vetus M34 (2008)
• Lying  ·  Portsmouth Harbour

Boatshed Portsmouth

This boat is off the market but here are some boats that are still for sale.

• Specification
• Additional Information

Extra Details

Sailing speed of 7.5 standard plus 200 miles per day is a regular occurrence. New gearbox fitted October 2012, new PSS stern seal 2010. 80 Amp engine start battery 2009 2 x 110 Amp hour batteries wired in parralell for domestic

Sloop rigged Selden Aluminium spars (2007) with Dyform standing rigging (2007)

Boom, Mast, Standing Rigging and Harken MK1V furling gear replaced 2007 along with 1 genoa halyard. 1 spinnaker and 2nd halyard have all been replaced since 2006. All halyards and racing sheets are Dyneema. All clutches replaced 2009. Carbon spinnaker pole tube replaced 2011. Aluminium spinnaker pole, Aluminium Selden bow sprit. Both mainsails have had leech blocks fitted to first two reefing points to make it easier. Additional sail to list above : Racing Main, Dyneema reinforced dacron Hyde Sails, 2009. 6 winches: 4 Harken 48ST as halyard and runner winches plus 2 Harken 53 3 speed non ST winches.

Electrical Systems

12 volt battery, 3 batteries charged by: engine, shore power Sterling charger 2012

Construction

Fin and wedge shaped bulb underwater profile. Topsides vinyl hull wrapped, cockpit teak replaced with Flexteek 2007. Kept in code since 2006. Glass in the hatch forward of mast replaced 2013.

Accommodation

Shower drain pump replaced 2006, calorifier replaced 2013, Spinflo Nelson cooker fitted 2006, fresh water pump fitted 2006, lee cloths fitted to all single plus port double, new upholstery and cushions 2009. New starboard toilet fitted 2013.

2 burner propane Stove

4 halyard winches 2 sheet winches 2 anchors (CQR & Breton Kedge) 20.00m of chain 10.00m of rode Sail cover 2009 Sprayhood 2011

Nav Equipment

3 x Raymarine ST70 Plus in Scanstrut pod mast, portside of cockpit 1 x ST70 Plus, 1 x i70, starboard cockpit ST60 Plus Graphic, i70 and E7 hybrid touchscreen plotter. At chart table, E9 hybrid touchscreen chart plotter and i70. Fluxgate compass with rate gyronetworked, Raymarine HD (tbc) radar mounted Scanstrut self levelling post networked to both plotters. Raytag MOB alarm connected to network with 2 tags. Navman DSC Radio. NASA Navtex connected to E9, Raymarine AIS transponder networked to i70's and both plotters. AIS is transponder and receiver.

Safety Equipment

3 bilge pumps (1 manual / 2 electric)

EPIRB requires service. Fire extinguishers and lifejackets serviced 2013 10 baltic winner auto/harness lifejackets with safety lines all fitted with hoods, lights and leg straps.

Broker's Comments

This Sigma 400 is IRC 1.2 she is a comfortable racer cruiser whilst satisfying the needs of a family or friends. Fully loaded with Raymarine navigation equipment she has had a considerable amount of money spent on her in the last few years not to mention the uber practical little sprayhood which her owner says was well worth it! She is a 1993 boat with a lot of life left in her as you will see when you race past everyone else on the water with minimal effort. These boat details are subject to contract. Note: Offers on the asking price may be considered.

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1994 Sigma 400 Technical Specs

General data about sigma 400.

Engine and Power Specs

Dimensions And Wieght

Detailed Specifications

Features And Equipments

Sailing features.

Other Equipments

Interior Specifications

Exterior Features

Electronical And Electrical Info

• Sigma provided us with the latest version of its 400 service repair manual
• Find All mechanical and electrical parts and accessories of Sigma 400 Power here

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• Yachting Monthly's Scuttlebutt
• Thread starter Memphis_Chung
• Start date 28 May 2009
• 28 May 2009

Memphis_Chung

Hi, Does anyone have an opinion on these good looking boats? As well as all round opinions, I am particularly interested in shorthand-ability as most pictures I see seem to have about 8 burly blokes on the rail! Thanks!  

Well-known member

They are Rob Humphryes designed. Years ago I spoke to a chap in the designers office about a 400. Very much a fully crewed boat with a huge main and needs 10 on the rail, forget about short handing. I got a 41 (David Thomas design, like all the real sigmas) instead. A completelty different type of boat.  

Active member

I've sailed a few 100 miles on one - Prime Evil owned by Wetstuff http://www.wetstuff.org.uk Great boats, but not the sort of boat I'd like to sail short handed though, they are fast and powerful and great fun to sail. accommodation is good, though small by todays standards 1 ensuite double aft to port , two singles to stb. double up front and a curved saloon, secure galley. Downside for cruising is the draft, over 2M /forums/images/graemlins/frown.gif Good solid fast racer cruises /forums/images/graemlins/smile.gif  

• 29 May 2009

I had seen Prime Evil on the web, she looks lovely. I suspected as much re short handing. shame - there are not alot of cruiser racer 40 footers out there in that price range. Dave.  

Dont know about the 40 but looked over her smaller sister the 35 and no way was it a good boat for single handing. There are few newish boats that do seem set up for single handing. My last Moody was cr*p for that. New boat (Stalight) is a bit better but would still require single handing with autohelm.  

I raced one across the Atlantic a few years ago, alot of fun, but with running backstays I am not sure I would want to shorthand. You really feel the power of that rig, great for playing on but could quickly turn into a headache if short of hands. Ants  

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• Boat REF#  ·  214064
• Length  ·  12.17m
• Year  ·  1992
• Construction  ·  GRP
• Underwater profile  ·  Fin
• Sleeping berths  ·  8
• Engine  ·  1 x diesel 35hp, Perkins M35 (1992)
• Lying  ·  Dublin

Boatshed Cork

This boat is off the market but here are some boats that are still for sale.

• Specification
• Additional Information

Extra Details

Sloop rigged Selden Aluminium spars (2000) with Stainless Steel standing rigging (2000)

Sails working well judging by this yacht's super performance in very competitive club racing scene. Many older sails also included.

Electrical Systems

12 volt battery, 3 batteries charged by: engine

Construction

Owner changed original tanks to Stainless Steel.

Accommodation

2 burner propane Stove

Nav Equipment

Chart Plotter very basic. Wind Speed instruments to be reviewed.

Safety Equipment

2 bilge pumps (2 manual / 0 electric)

All ORC Cat 2 Safety Equipment included

Broker's Comments

When you step on board this Sigma 400 you get an immediate feeling of strength and stability. She is very well built and has proven to be a very fast cruiser / racer as expected from a Rob Humphries design.

Her overall hull design was based on the 1988 Whitbread Maxi 'Rothmans' and this clearly gives her the famous balance and stablity she is known to deliver particularly in heavy weather. This boat has raced some Round Irelands and Fastnets but has for the last decade been a great performer on IRC in a very competitive 'round the cans' club scene. Equally happy racing or doing some serious miles, this is a lot of boat for a 40 footer, and will provide the new owner with the much sought-after combination of fast racing and comfortable cruising.

Set up for racing at the moment, she needs only a little bit of polish to get her back looking tip top. A new set of cushions below would be a great advantage, and although not necessary, a sand and varnish below decks would have her looking brand new.

- These boat details are subject to contract. Note: Offers on the asking price may be considered.

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Used Sigma 400 for sale

Sigma 33 ood, the review of our community on the sigma 400, why trust us , already 4 boats sold through us, sigma 400: organize the purchase of your boat, how to buy your boat.

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Sigma Yachts Sigma 400

General Data

Shipbuilder:, see also: boats for sale.

• BENETEAU FIRST 40.7 RACE
• Jeanneau SUN ODYSSEY 42.1
• Jeanneau SUN LEGENDE 41

Overall length:

Waterline length:, maximum beam:, straightening:.

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• Boat REF#  ·  101604
• Length  ·  12.27m
• Year  ·  1992
• Construction  ·  GRP
• Underwater profile  ·  Fin
• Sleeping berths  ·  8
• Engine  ·  1 x diesel 35hp, Perkins Perama M35 (1992)
• Lying  ·  North Wales

Boatshed North Wales

This boat is off the market but here are some boats that are still for sale.

• Specification
• Additional Information

Extra Details

Engine Rebuild 2000

Sloop rigged Selden Aluminium spars (2000) with Stainless Steel standing rigging (2005)

Many Sails (Ask) 2 Runner Winches Plus One Reefing.

Electrical Systems

12 volt battery, 3 batteries charged by: engine, shore power

Construction

Accommodation

2 burner propane Stove

2 halyard winches 2 sheet winches Electric Lofrans windlass 2 anchors (CQR 35lb) 60.00m of chain Mailspeed 285 dinghy (2000) (Inflatable) 2.5hp outboard, Mariner, Short shaft (2000) Mailspeed 285 Inflatable With Deck Bag and Anchor Chain Warp

Nav Equipment

Safety Equipment

2 bilge pumps (2 manual / 0 electric)

Broker's Comments

The Sigma 400 is a well made fast cruiser racer, and is still proving competitive today. The overall hull design was based around the 1988 Whitbread Maxi Rothmans. This Sigma 400 was a well know boat in the 90's. I have personally spent months aboard this boat in the 90's and know her inside out. Her performance, balance, ability in heavy weather is amazing. In her later years she has been cruised mainly in the Irish sea where Derek (Boatshed) has spent time skippering her.

These boat details are subject to contract. Note: Offers on the asking price may be considered.

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Sigma 400 Boat for Sale

• accommodation
• mechanical and rigging
• Manufacturer: Sigma
• Location: Dublin
• LOA: 40'3" (12.27m)
• Beam: 12' 9'' (3.89m)
• Draft: 2.29
• Keel: Fin keel
• ID no.: 30281
• Engine Make: Perkins Perama
• Horsepower: 29hp
• Drive Type: Shaft drive
• Fuel Type: Diesel
• Fuel Tank Size: 50 Litres

Broker Remarks

Rob Humphries design for performance cruising and passage making. This yacht has had many successful racing exploits and provided spacious cruising for its family owners. Lead keel, quality deck hardware and a most spacious interior with two double cabins aft. Reliable Perkins Perma diesel.

Accommodation

Large cockpit with teak seats and sold. Sugar scoop stern with boarding shelf. Large saloon with circular surround seating. Two aft cabins. Heads for and aft. Fore cabin with infill piece and over large escape hatch. Galley with island work top to port side of saloon. H&C pressure system. Cooker. Chest fridge. Cockpit with two lockers. Stainless steel grab rails on coachroof. 2 heads with Jabasco toilets. Wash basins.

Mechanical and Rigging

Perkins Perama M30 Diesel 3 cylinder Shaft drive to two blade Gori folding propeller. Shaft through P bracket. Water cooled pack gland. Anti Siphon on exhaust. 2013 keel stepped mast. Fractional rig. Rod kicker by Seldén Spinnaker pole 10 clutches on coachroof 2 X harken 34ST's on coachroof. 2 X Harken 50 ST primary winches. 2 X Harken 44 spinnaker sheet winches.

Stainless steel wheel Emergency tiller. 16kg CQR anchor Fire blanket 3 X Fire extinguishers. Manual & electric bilge pumps. EPIRB Plastimo dome compass on binnacle. Navman 7100 VHF Lorenz Chart plotter B&G log, depth & wind. B&G Hydra Pilot. Sony AM/FM radio 2X 96 AM batteries. Cockpit spray hood Complete cockpit tent with windows Fenders sail cover

Contact NYB Dublin

• Address: Network Yacht Brokers Dublin Leinster Boats 5 Doonanore Park, Dun Laoghaire, County Dublin, Ireland. A96X4W9
• Telephone: [+353] [0] 86 2543866 [+353] [0] 86 2543866 -->
• Email: [email protected]
• Link to full office details

Disclaimer : Leinster Boats offers the details of this vessel for sale but cannot guarantee or warrant the accuracy of the information contained in the specification or warrant the condition of the vessel or equipment. A buyer should instruct his agents, or surveyors, to investigate such details as the buyer desires validated. This vessel is offered for sale subject to no prior sale, price change, or withdrawal without notice.

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Design number: 85 Year: 1990

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