Jouët 920 Keel and centerboard

Sailboat specifications

The Jouët 920 is a 30’5” (9.27m) cruising sailboat designed by Daniel Tortarolo (France). She was built between 1979 and 1984 by Yachting France (France). The Keel and centerboard version features a centerboard inside of a short fin-keel allowing shoal draft while maintaining upwind capabilities.

The Jouët 920 is as well listed, on Boat-Specs.com, in Deep draft version (see all the versions compared).

Jouët 920's main features

Model: Jouët 920
Version: Keel and centerboard
Hull type: Monohull
Category: Cruising sailboat
Sailboat builder: Yachting France
Sailboat designer: Daniel Tortarolo
Sailboat range: Jouët
Sailboat collection: Half Ton class
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: 1984
Appendages: Centerboard : pivoting centerboard in the keel
Helm: Single tiller
Rudder: Single semi-spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 2
Standard public price ex. VAT (indicative only): N/A €

Jouët 920's main dimensions

Hull length: 30’ 5”9.27 m
Waterline length: 23’ 10”7.25 m
Beam (width): 10’ 2”3.12 m
Waterline beam (width): 8’ 7”2.62 m
Draft: 5’ 8”1.75 m
Draft when appendages up: 3’ 4”1 m
Mast height from D_WL: 36’ 7”11.15 m
Fore freeboard: 3’ 5”1.03 m
Mid-ship freeboard: 3’ 2”0.97 m
Light displacement (M_LC): 6658 lb3020 kg
Maximum displacement (M_LDC): 8157 lb3700 kg
Ballast weight: 2425 lb1100 kg
Ballast type: Cast iron
French customs tonnage: 9.00 Tx

Jouët 920's rig and sails

Upwind sail area: 539 ft²50.04 m²
Downwind sail area: 916 ft²85.14 m²
Mainsail area: 195 ft²18.14 m²
Genoa area: 343 ft²31.9 m²
Jib area: 195 ft²18.1 m²
Symmetric spinnaker area: 721 ft²67 m²
P iMainsail hoist measurement (from tack to head): 30’ 8”9.35 m
E iMainsail foot measurement (from tack to clew): 10’ 6”3.2 m
Rigging type: Sloop Marconi masthead
Mast configuration: Deck stepped mast
Rotating spars: No
Number of levels of spreaders: 1
Spreaders angle: 0 °
Spars construction: Aluminum spars
Standing rigging: 1x19 strand wire continuous

Jouët 920's performances

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.: 15.0
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.: 258 ft²/T23.95 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.: 439 ft²/T40.75 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.: 224
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.: 36 %
Wetted area: 199 ft²18.53 m²
Maximum transverse section: 11 ft²1.02 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.: 6.54 knots