Océanis 320 Wing keel

Sailboat specifications

The Océanis 320 is a 30’4” (9.25m) cruising sailboat designed by Philippe Briand (France). She was built between 1987 and 1992 by Bénéteau (France) with 359 hulls completed. The Wing keel version is offered with a short keel fitted with large winglets. This configuration provides an interesting draft / low center of gravity / upwind performance trade-off.

The Océanis 320 is as well listed, on Boat-Specs.com, in Fin keel version (see all the versions compared).

Océanis 320's main features

Model: Océanis 320
Version: Wing keel
Hull type: Monohull
Category: Cruising sailboat
Sailboat builder: Bénéteau
Sailboat designer: Philippe Briand
Sailboat range: Océanis
Country: France
Construction: GRP (glass reinforced polyester):
Single skin fiberglass polyester
Number of hulls built: 359
First built hull: 1987
Last built hull: 1992
Appendages: Keel : wing keel
Helm: Single tiller
Rudder: Single spade rudder
Unsinkable: No
Trailerable: No
Former French navigation category: 2
Standard public price ex. VAT (indicative only): N/A €

Océanis 320's main dimensions

Overall length: 31’ 6”9.6 m
Hull length: 30’ 4”9.25 m
Waterline length: 27’ 8”8.44 m
Beam (width): 10’ 8”3.26 m
Draft: 3’ 10”1.15 m
Mast height from D_WL: 44’ 11”13.7 m
Light displacement (M_LC): 8818 lb4000 kg
Ballast weight: 2646 lb1200 kg
Ballast type: Cast iron
French customs tonnage: 11.00 Tx

Océanis 320's rig and sails

Upwind sail area: 544 ft²50.5 m²
Downwind sail area: 958 ft²89 m²
Mainsail area: 199 ft²18.5 m²
Genoa area: 344 ft²32 m²
Stormjib area: 62 ft²5.75 m²
Symmetric spinnaker area: 759 ft²70.5 m²
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

Océanis 320'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.: 16.0
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.: 216 ft²/T20.04 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.: 380 ft²/T35.32 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.: 188
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.: 30 %
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.: 7.05 knots