dufour 31 sailboat data

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• Sailboat Guide

Dufour 31 is a 30 ′ 10 ″ / 9.4 m monohull sailboat designed by Michel Dufour and built by Dufour Yachts starting in 1973.

• 2 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 3 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 4 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 5 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 6 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 7 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 8 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 9 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 10 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 11 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 12 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View
• 13 / 13 Key West, FL, US 1977 Dufour 31 $24,000 USD View

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)

Not to be confused with the DUFOUR 3800 AKA DUFOUR 31 FRERS (1980). Tall Rig- I: 41.20’ J: 11.97’ P: 36.90’ E: 10.20’

Shallow draft: 4.75’ One owner reports Volvo MD2B as original engine.

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Dufour 31, your thoughts

• Thread starter fred1diver
• Start date Jan 24, 2022
• Forums for All Owners
• Ask All Sailors

Hey everyone, it’s me again asking what you think about boats I’m looking to buy. The Pearson 30 I was looking at had some repairs to do but not too bad but has a gaz engine, would prefer diesel. 8000$ The cherubini I went to look at is a MAJOR renovation project and is located 4 hours away. 6000$ the Dufour 3800, 31 feet, I’m looking at is more expensive but is in pristine condition, it is about two hours away but it’s in the states on lake Champlain, so I would need to get it transported back here, no biggie. 24 900$ but I don’t know much about Dufour, I know they are French made boats, my uncle had one since 1975, now his sons have it since my uncle passed, I’ve been told it’s a fast boat, but don’t know anything else  

Based on these options I would purchase the pristine Defour 3800 SailboatData.com - DUFOUR 3800 Sailboat based on your uncle and sons experience and avoid a gasser and major repairs. After a marine and diesel engine surveys then you will know if it is the right sailboat.  

Dufour for sure. Just do it.  

Just took a look at the SailboatData.com info. German Frers is a well known yacht designer. He designs fast boats that are fun to sail.  

Dlochner just not sure I’ll pass under all the bridges lol The boat is with a broker  

dlochner said: Just took a look at the SailboatData.com info. German Frers is a well known yacht designer. He designs fast boats that are fun to sail. Click to expand

fred1diver said: Dlochner just not sure I’ll pass under all the bridges lol The boat is with a broker Click to expand

Sounds like a no-brainer if it will pass inspection. $24.9k is a LOT for an old boat, however. $ 10-15k might do it.  

Stu Jackson

@fred1diver I looked at boats in the Lake Champlain area a few years ago when I was in the market. That was when Mr. Trump killed free trade so the duty added I think it was 9.5%. Since this is a French made boat, you won't be able to take advantage of free trade and you will need to factor in the duty. That's a big premium to pay and there are a lot of nice boats in that price range within Canada. Dufour's are nice boats but I'm not sure I'd pay the duty premium for that one. For instance, there is a nice looking Aloha 34 in Midland for around the same price 1979 Aloha 34 Sloop for sale - YachtWorld There are even a couple of Dofour 31s in Ontario for similar pricing (including duty) 1982 Dufour 31 Cruiser for sale - YachtWorld  

Careful- though they're both 31 feet long, the Dufour 31 is not the same boat as the Dufour 3800 that the OP is considering.  

The Canadian taxes have been paid already  

garymalmgren

Two hours drive will help you make up your mind. Love at first sight is the way I go. And it hasn't really let me down. Ya got any photos for us to drool over? gary  

I'd rather have the Atomic 4 than the Volvo diesel. Frers is a good designer. The numbers for the 3800 do not indicate a rocket ship. SA/D of 17.11 would be underpowered. Disp./length of 231.56 is a bit chunky. A 10.66 foot beam on a 25.26 water line is a little fat. On the view of the cabin layout I believe the ends are pinched in IOR style. That is a dated design. Combined with a masthead rig it may be a bit to handle. Note that in the picture of the boat sailing there are 2 people on the rail and the sails indicate a reach. Comfort ratio of 20.55. Draft 5.58 would be too much in my old sailing ground. For me, I wouldn't pay 24.9 k for a 40 year old dated design and I would take a pass. The Pearson numbers are remarkably similar. It is an even more dated design. But Bill Shaw boats were known for their easy going ride. Nothing extreme. Maybe a bit boring. But they would take care of you. As SBD.com says over a 1,000 were built and Bill Shaw owned one for 10 years. Comfort ratio of 24.25. But I would try to get the price down. 8K for a 50 year old boat seems a bit much. It would have to survey perfectly.  

Attachments

Go with the pristine boat, always. The Dufour looks like a good boat but I would measure it against the "standard" in that size range (imho), the Catalina 30. More than 6,000 were produced, bigger interior, great support available, sails well, easier to sell at the end. For 25k you should be able to find a C30 in excellent shape.  

SBO Weather and Forecasting Forum Jim & John

Dufour's are a boat that gives a pleasing ship line to the eye. Sleek deck, sharp bow, slender lines a boat that will bring a smile as you see her in the marina. There build from 1980 to 84. I found this one for sale in Maryland 1983 Dufour 3800 Racer/Cruiser for sale - YachtWorld A boat that is 40 years old is difficult to describe as pristine.  

Hello Below

fred1diver said: the Dufour 3800, 31 feet, I’m looking at is more expensive but is in pristine condition, it is about two hours away but it’s in the states on lake Champlain, so I would need to get it transported back here, no biggie. 24 900$ Click to expand

jssailem said: . 1983 Dufour 3800 Racer/Cruiser for sale - YachtWorl d. Click to expand

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Review of Dufour 31

Basic specs.

The keel is made of iron. Many people prefer lead keel in favour of iron. The main argument is that lead is much heavier than iron and a lead keel can therefore be made smaller which again result in less wet surface, i.e. less drag. In fact iron is quite heavy, just 30% less heavy than lead, so the advantage of a lead keel is often overstated.

The boat can enter most marinas as the draft is just about 1.74 - 1.84 meter (5.71 - 6.01 ft) dependent on the load. See immersion rate below.

Dufour 31 is typically equipped with a Volvo Penta diesel engine at 10.0 hp (7 kW), which gives a max speed about 3.7 knots.

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 Capsize Screening Formula (CSF)?

The capsize screening value for Dufour 31 is 1.98, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.

What is Theoretical Maximum Hull Speed?

The theoretical maximal speed of a displacement boat of this length is 6.4 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 Dufour 31 is about 148 kg/cm, alternatively 832 lbs/inch. Meaning: if you load 148 kg cargo on the boat then it will sink 1 cm. Alternatively, if you load 832 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 Motion Comfort Ratio (MCR)?

What is L/B (Length Beam Ratio)?

What is a Ballast Ratio?

What is Displacement Length Ratio?

What is Relative Speed Performance?

Maintenance

When buying anti-fouling bottom paint, it's nice to know how much to buy. The surface of the wet bottom is about 26m 2 (279 ft 2 ). Based on this, your favourite maritime shop can tell you the quantity you need.

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 changes, 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.

We are always looking for new photos. If you can contribute with photos for Dufour 31 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us . Criticism helps us to improve.

DUFOUR 31 Detailed Review

If you are a boat enthusiast looking to get more information on specs, built, make, etc. of different boats, then here is a complete review of DUFOUR 31. Built by Dufour Yachts (FRA) and designed by Michel Dufour, the boat was first built in 1973. It has a hull type of Fin with rudder on skeg and LOA is 9.4. Its sail area/displacement ratio 14.04. Its auxiliary power tank, manufactured by Volvo, runs on Diesel.

DUFOUR 31 has retained its value as a result of superior building, a solid reputation, and a devoted owner base. Read on to find out more about DUFOUR 31 and decide if it is a fit for your boating needs.

Boat Information

Boat specifications, sail boat calculation, rig and sail specs, auxillary power tank, accomodations, contributions, who designed the dufour 31.

DUFOUR 31 was designed by Michel Dufour.

Who builds DUFOUR 31?

DUFOUR 31 is built by Dufour Yachts (FRA).

When was DUFOUR 31 first built?

DUFOUR 31 was first built in 1973.

How long is DUFOUR 31?

DUFOUR 31 is 7.01 m in length.

What is mast height on DUFOUR 31?

DUFOUR 31 has a mast height of 10.15 m.

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1982 Dufour 31 Technical Specs

General data about dufour 31, engine and power specs, dimensions and wieght, detailed specifications, features and equipments, sailing features, safety features, other equipments, interior specifications, exterior features, engine and mechanical specs, electronical and electrical info, deck hardware.

More 31 models

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Hi, I own a 1979 Dufour 31 and am intending to install side cokpit seats on the corner of each side of pushpit railing. Does anyone have a photograph with these done. I would also like to move my electronic displays from starboard side (next to cabin entrance) to centre above cabin sliding cover and would prefer if anyone could provide clos up photographs. regards Petar  

I have a 77 Dufour 31 and have recently joined a Dufour Owners Assoc in the UK (the only one I could locate) Their web is www.dufour.org.uk They have a wealth of info, US membership is $30 which includes newsletters and all contributions from years of owners input. Charles Marchant ([email protected]) owns a 81 Dufour 31 and said there was an article in DIY marine maintenance magazine regarding one of the associations owners installing pushpit railing seating. I have not followed up on this yet but if you are not familar with DIY, their web is www.diy-boat.com. There is also a picture of the seats on the inside cover of my Spring 2005 newsletter I would be happy to copy & send to you if you provide your address. My electronics are above the companionway. I will also forward this picture along with the pushpits. Denise  

Denise, Thank you kindly on information provided. I am aware of Dufour Owners Association and have joined them in April this year. I have even received an article about these pushpit railing seats, however was looking for more info in order to make good decision. A close up photograph and some info about fitting electronics above companionway would realy be good. My e-mail address is: [email protected] or [email protected] Best regards Petar  

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Our verdict on the Dufour 310

• Graham Snook
• June 22, 2015

With many sub-32ft boats on the market, Graham Snook visits Plymouth to see if the Dufour 310 stands out from the crowd, here's his verdict on her.

© Graham Snook Photography Moral Rights Asserted

What’s she like to sail? The Dufour 310 stands out by having twin wheels, but I’m not convinced that they’re necessary, or even desirable, on a 31ft boat. Like many other systems with two heavy, stainless steel wheels, when you move your wheel there’s an echo of movement from the rotational inertia of the wheel opposite.

Would she suit you and your crew? Masochistic mechanics aside, she’ll make a great boat for a couple with or without children, or those moving up from smaller or older boats. She’s easy to sail and can be handled short-handed. The cockpit coaming is a winch-free area, leaving it safe for little (or big) hands to roam unimpeded. She’s available in three versions: Day Sail, Liberty and Adventure. At 1.90m her draught is quite deep for cruising some parts of the UK, but it does add to her performance – a ballasted centreboard is an option. The Dufour 310’s cockpit makes a good entertaining area when the weather allows, and the saloon could sit six around the large table. She’s nimble enough to be fun to sail and would be a great boat in which to introduce your friends and family to sailing. There’s enough deck stowage for dinghy, fenders, warps and so on. If it wasn’t for the dreadful access to the engine’s service points she’d make a enjoyable port-hopping coastal cruiser.

Price (as tested) £111,174 inc VAT LOA 9.67m (31ft 9in) LWL 8.70m (28ft 7in) Beam 3.31m (10ft 10in) Draught 1.90m (6ft 3in) Displacement 4940kg (10,890 lb) Ballast 1300kg  (2,866 lb) Ballast ratio 26.3% Sail area 50.3m2 (541sq ft) SA/D ratio 17.6 Diesel 90lit (20 gal) Water 160lit (35 gal) Engine 20hp diesel saildrive RCD category B Designer Felci Yachts Builder Dufour Yachts UK Agent Network Yacht Brokers Southwest Ltd Tel 01752 605 377

The Dufour 34 is a 33.63ft masthead sloop designed by Michael Dufour and built in fiberglass by Dufour Yachts (FRA) since 1974.

The Dufour 34 is a moderate weight sailboat which is a reasonably good performer. It is very stable / stiff and has a good righting capability if capsized. It is best suited as a coastal cruiser. The fuel capacity is originally small. There is a short water supply range.

Dufour 34 for sale elsewhere on the web:

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Sailing Yachts Dufour

Dufour yachts dna.

Constantly looking to the future, Dufour as a boat Manufacturer , designs each new model to provide pleasure and feel in complete serenity, whatever your cruising project and however you use your yacht. For over 60 years, we have been designing and building innovative, high-performance sailing boats . Marked by an assertive character and an identity recognisable among the crowd, Dufour yachts suit your desires and your boating programme to offer you amazing and comfortable sailing experiences and the pride of owning an elegant and safe yacht from an emblematic brand…

Our range of sailing yachts

The Dufour range of sailing boats comprises 9 iconic models, designed to suit every sailing programme. For long-term family cruising, or enjoyable weekends along the coast, or for racing and pushing the experience of heeling to the max. For over 60 years, Dufour yachts has a boat manufacturer have demonstrated their adaptability and versatility through beautiful innovations.

Dufour 37 sailboat

Dufour 390 sailboat

Dufour 430 sailboat

Dufour 44 Sailboat

Dufour 470 sailboat

Dufour 530 sailboat

Dufour 56 sailboat

Dufour 61 Sailboat

Dufour Virtual marina

Just as if you were really there… Embark aboard the model of your choice from the Dufour sailing yacht range thanks to an immersive tour that begins on the pontoons of the new Dufour Virtual Marina, offering the most realistic visiting experience ever! Exterior views of the range, visits from the deck of the boats to the interior by choosing the Vintage and the version that suits you… Everything is brought together to offer you a complete and interactive opportunity to discover the range from the comfort of your own home…

Dufour Sailing boats experience

Owners of Dufour sailing boats are sailing all the seas of the world… Because their stories are our greatest pride and joy… Because these sailing stories are for us the best proof that the Dufour experience is both unique and shared… We invite you to discover, through real stories, Instagram photos or even from the Dufour community site, a glimpse of what life on board a Dufour Yacht is all about…

Environmental commitments

Dufour is committed to preserving the oceans and marine wildlife, and is launching with Fountaine Pajot, its own collaborative innovation platform #ODSeaLab . An accelerator of technological solutions whose goal is to transform production processes and the choice of materials, and mainly to implement innovations in renewable energy production , electricity storage and the electrification of propulsion and life on board..

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