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Sailboat specifications and datasheets

Jouët 920 deep draft

The Jouët 920, here in "deep draft" version, is a 30’5” monohull sailboat designed by Daniel Tortarolo. She was built by Yachting France (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1979 and 1984 with about 200 hulls completed.

The Jouët 920 belongs to the Jouët range and the Half Tonner class.

Yachting France Jouët 920 Yachting France Jouët 920 layoutYachting France Jouët 920 accommodations
Jouët 920's   Main Features
Model Jouët 920
Version Deep draft
Type of hull Monohull
Shipyard
Designer Daniel Tortarolo
Range Jouët
Class Half Tonner
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1979
Last built hull 1984
Number of hulls built About 200
Appendages Keel :
Fin without bulb
Helm 1 tiller
Rudder 1 semi-spade rudder
Unsinkable No
Trailerable No
French navigation category 2
Standard public price (indicative only) N/A
Jouët 920's   Main dimensions
Hull length 30’ 5”
Waterline length 23’ 10”
Beam (width) 10’ 2”
Waterline beam (width) 8’ 7”
Draft 5’ 10”
Mast height from DWL 36’ 7”
Fore freeboard 3’ 5”
Mid-ship freeboard 3’ 2”
Light displacement 6658 lbs
Maximum displacement 8157 lbs
Ballast weight 2425 lbs
Ballast type Cast iron
French customs tonnage 9.00 Tx
Jouët 920's   Rig and sails
Upwind sail area 539 sq.ft
Downwind sail area 916 sq.ft
Mainsail area 195 sq.ft
Genoa area 343 sq.ft
Jib area 195 sq.ft
Symetric spinnaker area 721 sq.ft
Rigging type Sloop Marconi masthead
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 0 °
PiMainsail hoist measurement (from tack to head) 30’ 8”
EiMainsail foot measurement (from tack to clew) 10’ 6”
Jouët 920's   Performances
HN (French rating) 15.0
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.
23.95
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.
40.75
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.
224
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.
36 %
Wetted surface 199 sq.ft
Maximum transverse section 11 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.
6.54 knots
Jouët 920's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine (min/max) 8 HP / 13 HP
Fuel type Diesel
Fuel tank capacity 10.6 gal
Jouët 920's   Accommodation
Cabin(s) 2
Berth(s) 6
Head(s) 1
Fresh water tank capacity 37 gal
Maximum headroom 6’ 1”

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