Detailed sailboat specifications and datasheets since 2015
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Dufour 1800 Shoal draft

Sailboat specifications

The Dufour 1800 is a 24’11” (7.6m) cruising sailboat designed by Laurent Cordelle (France) and Michel Dufour (France). She was built between 1979 and 1982 by Dufour (France). The Shoal draft version features a shorter keel to grant access to shallow areas.

The Dufour 1800 is as well listed, on Boat-Specs.com, in Deep draft version (see all the versions compared).

Dufour 1800's main features

Model
Dufour 1800
Version
Shoal draft
Hull type
Monohull
Category
Coastal cruising sailboat
Sailboat builder
Sailboat designer
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
About 200
First built hull
1979
Last built hull
1982
Appendages
Keel : fin without bulb
Helm
Single tiller
Rudder
Single spade rudder
Unsinkable
No
Trailerable
No
Former French navigation category
3
Standard public price ex. VAT (indicative only)
N/A

Dufour 1800's main dimensions

Hull length
24’ 11”7.6 m
Waterline length
22’6.7 m
Beam (width)
8’ 7”2.62 m
Waterline beam (width)
6’ 11”2.1 m
Draft
3’ 7”1.1 m
Mast height from DWL
35’ 5”10.8 m
Fore freeboard
3’0.92 m
Mid-ship freeboard
2’ 8”0.83 m
Light displacement (MLC)
4321 lb1960 kg
Maximum displacement (MLDC)
5401 lb2450 kg
Ballast weight
1653 lb750 kg
Ballast type
Cast iron
French customs tonnage
4.37 Tx

Dufour 1800's rig and sails

Upwind sail area
333 ft²30.93 m²
Downwind sail area
531 ft²49.29 m²
Mainsail area
154 ft²14.29 m²
Genoa area
179 ft²16.64 m²
Jib area
101 ft²9.37 m²
Symmetric spinnaker area
377 ft²35 m²
I
 iFore triangle height (from mast foot to fore stay top attachment)
27’ 7”8.4 m
J
 iFore triangle base (from mast foot to bottom of forestay)
8’ 6”2.58 m
P
 iMainsail hoist measurement (from tack to head)
27’ 11”8.5 m
E
 iMainsail foot measurement (from tack to clew)
9’ 10”3 m
Rigging type
Sloop Marconi 7/8
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Dufour 1800's performances

IOR rating
 iIOR, or International Offshore Rule, was a measurement rule system used internationally for ocean racing. It allows boats of different sizes and designs to race each other fairly. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
18.1
HN (French rating)
 iHN or "Handicap Nationale" is an empirical rating system used in France allowing various monohulls, of different sizes and designs, to race each other fairly. It is particularly suitable for cruiser and cruiser-racer. Therefore, by comparing these values, we can have an indication of the relative speed of 2 boats.
9.0
Upwind sail area to displacement
 iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.

The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size.

Upwind: under 18 the ratio indicates a cruise oriented sailboat with limited performances especially in light wind, while over 25 it indicates a fast sailboat.
213 ft²/T19.75 m²/T
Downwind sail area to displacement
 iThe ratio sail area to displacement is obtained by dividing the sail area by the boat's displaced volume to the power two-thirds.

The ratio sail area to displacement can be used to compare the relative sail plan of different sailboats no matter what their size.
339 ft²/T31.47 m²/T
Displacement-length ratio (DLR)
 iThe Displacement Length Ratio (DLR) is a figure that points out the boat's weight compared to its waterline length. The DLR is obtained by dividing the boat's displacement in tons by the cube of one one-hundredth of the waterline length (in feet).
The DLR can be used to compare the relative mass of different sailboats no matter what their length:

a DLR less than 180 is indicative of a really light sailboat (race boat made for planning), while a DLR greater than 300 is indicative of a heavy cruising sailboat.
185
Ballast ratio
 iThe Ballast ratio is an indicator of stability; it is obtained by dividing the boat's displacement by the mass of the ballast. Since the stability depends also of the hull shapes and the position of the center of gravity, only the boats with similar ballast arrangements and hull shapes should be compared.

The higher the ballast ratio is, the greater is the stability.
38 %
Wetted area
145 ft²13.45 m²
Maximum transverse section
8 ft²0.76 m²
Critical hull speed
 iAs a ship moves in the water, it creates standing waves that oppose its movement. This effect increases dramatically the resistance when the boat reaches a speed-length ratio (speed-length ratio is the ratio between the speed in knots and the square root of the waterline length in feet) of about 1.2 (corresponding to a Froude Number of 0.35) . This very sharp rise in resistance, between speed-length ratio of 1.2 to 1.5, is insurmountable for heavy sailboats and so becomes an apparent barrier. This leads to the concept of "hull speed".
The hull speed is obtained by multiplying the square root of the waterline length (in feet) by 1.34.
6.28 knots

Dufour 1800's auxiliary engine

Engine(s)
1 outboard or inboard engine
Engine(s) power
8 HP
Fuel type
Gas

Dufour 1800's accommodations and layout

Cockpit
Closed aft cockpit
Cabin(s)
1
Berth(s)
4
Head(s)
1
Freshwater tank capacity
25.1 gal95 liters
Maximum headroom
5’ 8”1.75 m
Galley headroom
5’ 2”1.58 m
Head headroom
5’ 1”1.55 m

Dufour 1800's saloon

Maximum headroom
5’ 4”1.62 m
Saloon table length
3’ 4”1 m
Saloon table width
1’ 11”0.58 m
Berth length
6’ 2”1.89 m
Chart table
2’ 10”0.85 m x 1’ 10”0.55 m
Berth width (head/feet)
1’ 11”0.59 m / 1’ 11”0.59 m

Dufour 1800's fore cabin

Berth length
6’ 7”2 m
Berth width (head/feet)
4’ 7”1.41 m / 0’ 8”0.2 m
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