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Sailboat specifications and datasheets

Dufour 1800 deep draft

The Dufour 1800, here in "deep draft" version, is a 24’11” monohull sailboat designed by Laurent Cordelle and Michel Dufour. She was built by Dufour (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1979 and 1982 with about 200 hulls completed.
Dufour 1800 Dufour 1800 sailplanDufour 1800 layoutDufour 1800 accommodations
Dufour 1800's   Main Features
Model Dufour 1800
Version Deep draft
Type of hull Monohull
Shipyard
Designer Laurent Cordelle
Michel Dufour
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1979
Last built hull 1982
Number of hulls built About 200
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 3
Standard public price (indicative only) N/A
Dufour 1800's   Main dimensions
Hull length 24’ 11”
Waterline length 22’
Beam (width) 8’ 7”
Waterline beam (width) 6’ 11”
Draft 4’ 4”
Mast height from DWL 35’ 5”
Fore freeboard 3’
Mid-ship freeboard 2’ 8”
Light displacement 4321 lbs
Maximum displacement 5401 lbs
Ballast weight 1653 lbs
Ballast type Cast iron
French customs tonnage 4.37 Tx
Dufour 1800's   Rig and sails
Upwind sail area 333 sq.ft
Downwind sail area 531 sq.ft
Mainsail area 154 sq.ft
Genoa area 179 sq.ft
Jib area 101 sq.ft
Symetric spinnaker area 377 sq.ft
Rigging type Sloop Marconi 7/8
Mast position Deck stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire continuous
Number of levels of spreaders 1
Spreaders angle Swept-back
IiFore triangle height (from mast foot to fore stay attachment) 27’ 7”
JiFore triangle base (from mast foot to bottom of forestay) 8’ 6”
PiMainsail hoist measurement (from tack to head) 27’ 11”
EiMainsail foot measurement (from tack to clew) 9’ 10”
Dufour 1800's   Performances
HN (French rating) 9.0
IOR rating 18.1
Upwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
19.75
Downwind sail area to displacementiThe 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 23 it indicates a fast sailboat.
31.47
Displacement-Length ratio (DLR)iThe Displacement Length ratio is a figure that points out the boat's weight compared to its waterline length. 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 ratioiThe Ballast ratio is an indicator of the stability; it is obtained by dividing the boat's displacement by the weight of the ballast. Since the stability depends also of the hull shape and the position of the center of gravity, only boats with similar ballast arrangements and hull shape should be considered.
Higher the ballast ratio is, greater is the stability.
38 %
Wetted surface 145 sq.ft
Maximum transverse section 8 sq.ft
Hull speediAs 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
Engine type Outboard or inboard engine
Engine 8 HP
Fuel type Gas
Dufour 1800's   Accommodation
Cabin(s) 1
Berth(s) 4
Head(s) 1
Fresh water tank capacity 25.1 gal
Chart table 2’ 10” x 1’ 10”
Maximum headroom 5’ 8”
Galley headroom 5’ 2”
Head headroom 5’ 1”
Dufour 1800's   Saloon
Maximum headroom 5’ 4”
Saloon table length 3’ 4”
Saloon table width 1’ 11”
Berth length 6’ 2”
Berth width (head/feet) 1’ 11”
Dufour 1800's   Fore cabin
Berth length 6’ 7”
Berth width (head/feet) 4’ 7”
0’ 8”

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