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Sailboat specifications and datasheets

Dufour A9000 deep draft

The Dufour A9000, here in "deep draft" version, is a 38’11” offshore monohull sailboat designed by Johan Valentijn and Michel Dufour. She was built by Dufour (France) and made of aluminum (5000 series). This sailboat was produced between 1979 and 1983.
Dufour A9000 Dufour A9000 sailplanDufour A9000 layoutDufour A9000 sailing
Dufour A9000's   Main Features
Model Dufour A9000
Version Deep draft
Type of hull Monohull
Shipyard
Designer Johan Valentijn
Michel Dufour
Construction Hull and deck:
Aluminum (5000 series)
First built hull 1979
Last built hull 1983
Appendages Keel :
Fin without bulb
Helm 1 wheel
Rudder 1 spade rudder
Unsinkable No
Trailerable No
French navigation category 1
Standard public price ex. VAT (indicative only) N/A
Dufour A9000's   Main dimensions
Length overall 40’
Hull length 38’ 11”
Waterline length 31’ 6”
Beam (width) 12’ 1”
Draft 6’ 8”
Light displacement 19842 lbs
Ballast weight 9259 lbs
Ballast type Aluminum keel filled with lead
Dufour A9000's   Rig and sails
Upwind sail area 1027 sq.ft
Downwind sail area 1707 sq.ft
Mainsail area 372 sq.ft
Genoa area 654 sq.ft
Jib area 422 sq.ft
Symetric spinnaker area 1335 sq.ft
Rigging type Sloop Marconi masthead
Mast position Keel stepped mast
Spars Mast and boom in Aluminum
Standing rigging 1x19 strand wire
Number of levels of spreaders 2
Spreaders angle 0 °
IiFore triangle height (from mast foot to fore stay attachment) 55’ 5”
JiFore triangle base (from mast foot to bottom of forestay) 15’ 11”
PiMainsail hoist measurement (from tack to head) 48’ 2”
EiMainsail foot measurement (from tack to clew) 15’ 1”
Dufour A9000'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.
22.05
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.
36.66
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.
288
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.
7.52 knots
Dufour A9000's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 50 HP
Fuel type Diesel
Fuel tank capacity 60.8 gal
Dufour A9000's   Accommodation
Berth(s) (min/max) 8 / 9
Fresh water tank capacity 66 gal
Dufour A9000's   Saloon
Maximum headroom 6’ 2”
Dufour A9000's   Fore cabin
Maximum headroom 5’ 7”
Dufour A9000's   Aft cabin
Maximum headroom 6’ 2”

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