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Océanis 331 Fin keel is a Cruising sailboat built by Bénéteau and designed by Finot Conq Architectes. Her first hull was built in 1999 with an overall lengh of 10.41 m or 34.2 ft long and a Deck stepped mast mast configuration.

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BENETEAU OCEANIS 331 FIN KEEL Sailboat Specifications​


Overall Length (LOA) m / ft10.41 m / 34.2 ft
Designer(s)Finot Conq Architectes
VersionFin keel
categoryCruising sailboat
Hull TypeMonohull
Number of Hulls Built822
First Hull Built1999
Last Hull Built2005
AppendagesKeel fin with bulb
HelmSingle helm wheel
RudderSingle spade rudder
CockpitClosed aft cockpit
Ballast TypeCast iron
Rigging TypeSloop Marconi masthead
Mast LayoutDeck stepped mast
Number of Head(s)1
Freshwater Tank Capacity lt/gal296 L / 78.2 gal
Ballast Ratio0.31


Overall Length (LOA) 10.41 m / 34.2 ft
Hull Length10 m / 32.10 ft
Waterline Length (LWL)9.3 m / 30.6 ft
Beam (width)3.46 m / 11.5 ft
Draft1.66 m / 5.5 ft
Light Displacement (MLC) 5100 kg / 11244 lb
Maximum Displacement4500 kg / 9920 lb
Ballast Weight1600 kg / 3527 lb


Critical Hull Speed7.40 knots
Capsize Screening Formula (CSF)2.09
Comfort Ratio19.42
Displacement-Length Ratio (DLR)180
Ballast Ratio0.31
Sail Area to Displacement17.39
Upwind Sail Area to Displacement19 m²/T / 205 ft²/T
Downwind Sail Area to Displacement35.24 m²/T / 379 ft²/T

Above Deck

Mast LayoutDeck stepped mast
Rotating SparsNo
Number of Levels of Spreaders1
Spreaders AngleSwept-back
Spars ConstructionAluminum spars
Standing Rigging1x19 strand wire continuous
Estimated Forestay Length13.07 m / 42.89 ft
Reported Sail Area46.45 m² / 500.00 ft²
Total Sail Area46.47 m² / 500.19 ft²
Upwind Sail Area56.3 m² / 606 ft²
Downwind Sail Area104.4 m² / 1124 ft²
Mainsail Area25.4 m² / 273 ft²
Genoa Area30.9 m² / 333 ft²
I41 ft * 12.5 m
J12.4 ft * 3.76 m
P34.1 ft * 10.4 m
E14 ft * 4.28 m

Engine Room

Engine(s)1 inboard engine
Engine(s) Power30 HP
Fuel typeDiesel
Fuel Tank Capacity70 L / 18.5 gal

Below Deck

Fridge Capacity150 L / 39.6 gal
Maximum Headroom6.4 ft * 1.92 m
Head Headroom6.2 ft * 1.88 m
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