Detailed sailboat specifications and datasheets since 2015
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Océanis 311 Fin keel

Sailboat specifications

The Océanis 311 is a 31’2” (9.5m) cruising sailboat designed by Finot Conq Architectes (France). She was built between 1997 and 2003 by Bénéteau (France) with 1042 hulls completed. The Fin keel version features an L-shaped keel providing a good performance/price trade-off.

The Océanis 311 is as well listed, on, in Keel and centerboard version (see all the versions compared).

Océanis 311's main features

Océanis 311
Fin keel
Hull type
Cruising sailboat
Sailboat builder
Sailboat designer
Sailboat range
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
Number of hulls built
First built hull
Last built hull
Keel : L-shaped keel (with bulb)
Single helm wheel
Single spade rudder
EC design category
 iThe CE design category indicates the ability to cope with certain weather conditions (the sailboat is designed for these conditions)

A: Wind < force 9, Waves < 10m
B: Wind < force 8, Waves < 8m
C: Wind < force 6, Waves < 4m
D: Wind < force 4, Waves < 0,5m
Standard public price ex. VAT (indicative only)

Océanis 311's main dimensions

Overall length
32’ 4”9.85 m
Hull length
31’ 2”9.5 m
Waterline length
28’ 11”8.8 m
Beam (width)
10’ 7”3.23 m
4’ 10”1.45 m
Light displacement (MLC)
8047 lb3650 kg
Ballast weight
2425 lb1100 kg
Ballast type
Cast iron
French customs tonnage
9.30 Tx

Océanis 311's rig and sails

Upwind sail area
538 ft²50 m²
Mainsail area
277 ft²25.7 m²
Genoa area
262 ft²24.3 m²
Rigging type
Sloop Marconi 19/20
Mast configuration
Deck stepped mast
Rotating spars
Number of levels of spreaders
Spreaders angle
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous

Océanis 311's performances

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.
227 ft²/T21.09 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.
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.
7.20 knots

Océanis 311's auxiliary engine

1 inboard engine
Fuel type
Fuel tank capacity
18.5 gal70 liters

Océanis 311's accommodations and layout

Closed aft cockpit
Cabin(s) (min./max.)
2 / 3
Berth(s) (min./max.)
6 / 8
Freshwater tank capacity
52.8 gal200 liters
Fridge/ice-box capacity
15.9 gal60 liters
Boiler capacity
5.8 gal22 liters
Maximum headroom
6’ 2”1.88 m
Galley headroom
6’1.83 m
Head headroom
5’ 11”1.81 m

Océanis 311's saloon

Maximum headroom
6’ 1”1.85 m
Berth length
6’ 4”1.93 m

Océanis 311's fore cabin

Maximum headroom
5’ 10”1.76 m
Berth length
6’ 7”2 m
Berth width
4’ 7”1.4 m

Océanis 311's aft cabin

Maximum headroom
6’1.82 m
Berth length
6’ 7”2 m
Berth width
6’ 5”1.95 m
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