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Sailboat specifications and datasheets

Dufour 39 deep draft

The Dufour 39, here in "deep draft" version, is a 38’1” offshore monohull sailboat designed by German Frers. She was built by Dufour (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1982 and 1996 with 120 hulls completed.
Dufour 39 Dufour 39 sailplanDufour 39 layoutDufour 39 layoutDufour 39 layoutDufour 39 accommodations
Dufour 39's   Main Features
Model Dufour 39
Version Deep draft
Type of hull Monohull
Shipyard
Designer German Frers
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich fiberglass / polyester
First built hull 1982
Last built hull 1996
Number of hulls built 120
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 1
Standard public price (indicative only) N/A
Dufour 39's   Main dimensions
Length overall 39’ 2”
Hull length 38’ 1”
Waterline length 30’ 6”
Beam (width) 12’ 6”
Draft 6’ 7”
Light displacement 14991 lbs
Ballast weight 6989 lbs
Ballast type Lead
French customs tonnage 13.76 Tx
Dufour 39's   Rig and sails
Upwind sail area 899 sq.ft
Downwind sail area 1631 sq.ft
Mainsail area 339 sq.ft
Genoa area 560 sq.ft
Symetric spinnaker area 1292 sq.ft
Rigging type Sloop Marconi masthead
Spars Mast and boom in Aluminum
Number of levels of spreaders 2
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 48’ 2”
JiFore triangle base (from mast foot to bottom of forestay) 15’ 2”
PiMainsail hoist measurement (from tack to head) 42’
EiMainsail foot measurement (from tack to clew) 14’ 5”
Dufour 39's   Performances
HN (French rating) 22.0
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.
23.26
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.
42.21
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.
239
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.
47 %
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.
7.40 knots
Dufour 39's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 29 HP / 43 HP
Fuel type Diesel
Fuel tank capacity 29.1 gal
Dufour 39's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 6 / 9
Head(s) 1
Fresh water tank capacity 52.8 gal
Maximum headroom 6’ 1”

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