dufour 31 sailboat data

• Yachting Monthly
• Digital edition

• August 5, 2009

Another highly successful model, selling more than 900 from 1973 onwards, the most striking feature of the Dufour 31 is her clipper bow. Like many Dufour yachts she was innovative for her time, with a spacious, six-berth interior (including a quarterberth and a dinette double) and 1.9m (6ft 3in) headroom. The galley and chart table are both a good size. The heads is amidships. She was a cruiser-racer in her day, but now rarely seen on the club circuit. However, the powerful masthead rig gives fast cruising performance.

LOA 9.40m (30ft 10in) LWL 7.00m (23ft) Beam 3.2m (10ft 6in) Draught 1.73m (5ft 8in) Displacement 3,696kg (9,400lb) 3,969kg (8,512lb) YM test report December 1981

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.

Member Boats at HarborMoor

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 shown boat owner's changes, improvements, etc. Here you might find inspiration for your boat.

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

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.

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• Sailboat Guide

Dufour 30/31 Frers

Dufour 30/31 Frers is a 30 ′ 6 ″ / 9.3 m monohull sailboat designed by German Frers and built by Dufour Yachts starting in 1980.

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)

Shoal Draft: 4.42’/1.35m Fractional Rig: I: 36.1’ J: 12.1’ P: 38.9’ E: 12.5’

Masthead tall: I: 41.3’ J: 12.1’ P: 36.0’ E: 10.2’

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Dufour 3800

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Dufour 31 - Sailboat Data, Parts & Rigging

Sailboat data, rig dimensions and recommended sail areas for Dufour 31 sailboat. Tech info about rigging, halyards, sheets, mainsail covers and more.

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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.

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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.  

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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Dufour classic 30

The dufour classic 30 is a 30.0ft masthead sloop designed by j & j design and built in fiberglass by dufour yachts (fra) since 1998..

The Dufour classic 30 is a light sailboat which is a good performer. It is reasonably stable / stiff and has a low righting capability if capsized. It is best suited as a day-boat. The fuel capacity is originally small. There is a short water supply range.

Dufour classic 30 for sale elsewhere on the web:

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