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Sailboat specifications and datasheets

Océanis 311 keel and centerboard

The Océanis 311, here in "keel and centerboard" version, is a 31’2” monohull sailboat designed by Jean Marie Finot and Pascal Conq. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. This sailboat was produced between 1997 and 2003 with 1042 hulls completed.

The Océanis 311 belongs to the Océanis range. The Océanis 311 is as well listed, on Boat-Specs.com, in version Fin keel.

Bénéteau Océanis 311 Bénéteau Océanis 311 sailplanBénéteau Océanis 311 layoutBénéteau Océanis 311 sailingBénéteau Océanis 311 sailingBénéteau Océanis 311 accommodationsBénéteau Océanis 311 detailBénéteau Océanis 311 detail
Océanis 311's   Main Features
Model Océanis 311
Version Keel and centerboard
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Jean Marie Finot
Pascal Conq
Range Océanis
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 1997
Last built hull 2003
Number of hulls built 1042
Appendages Centerboard :
Centerboard in the keel
Helm 1 wheel
Rudder 2 spade rudders
Cockpit Closed aft cockpit
Unsinkable No
Trailerable No
EC certification B
Standard public price ex. VAT (indicative only) N/A
Océanis 311's   Main dimensions
Length overall 32’ 4”
Hull length 31’ 2”
Waterline length 28’ 11”
Beam (width) 10’ 7”
Draft 6’ 7”
Draft when appendages up 2’ 7”
Light displacement 8708 lbs
Ballast weight 3086 lbs
Ballast type Cast iron
French customs tonnage 9.30 Tx
Océanis 311's   Rig and sails
Upwind sail area 538 sq.ft
Mainsail area 277 sq.ft
Genoa area 262 sq.ft
Rigging type Sloop Marconi 19/20
Rotating spars No
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 Swept-back
Océanis 311's   Performances
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.
20.01
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.
164
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.
35 %
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.
7.20 knots
Océanis 311's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Fuel type Diesel
Fuel tank capacity 18.5 gal
Océanis 311's   Accommodation
Cabin(s) (min/max) 2 / 3
Berth(s) (min/max) 6 / 8
Head(s) 1
Fresh water tank capacity 52.8 gal
Water heater capacity 5.8 gal
Fridge/ice-box capacity 15.9 gal
Maximum headroom 6’ 2”
Galley headroom 6’
Head headroom 5’ 11”
Océanis 311's   Saloon
Maximum headroom 6’ 1”
Berth length 6’ 4”
Océanis 311's   Fore cabin
Maximum headroom 5’ 10”
Berth length 6’ 7”
Berth width 4’ 7”
Océanis 311's   Aft cabin
Maximum headroom 6’
Berth length 6’ 7”
Berth width 6’ 5”

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