The
Océanis 31 is a 30’6” (9.3m) cruising sailboat designed by
Finot Conq Architectes (France). She was built between 2007 and 2019 by
Bénéteau (France). The
Keel and centerboard version features a centerboard inside of a short fin-keel allowing shoal draft while maintaining upwind capabilities.
The
Océanis 31 has also been marketed as
Bénéteau 31 and she is as well listed, on Boat-Specs.com, in
Deep draft and
Shoal draft version (
see all the versions compared).
Océanis 31's main features
Model
Océanis 31
Version
Keel and centerboard
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
Sailboat range
Country
France
Construction
GRP (glass reinforced polyester):
- Hull: Single skin fiberglass polyester
- Deck: Sandwich balsa fiberglass polyester
First built hull
2007
Last built hull
2019
Appendages
Centerboard : pivoting centerboard in the keel
Helm
Single helm wheel
Rudder
Twin spade rudders
Unsinkable
No
Trailerable
No
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 < 0,5mB
Standard public price ex. VAT (indicative only)
Océanis 31's main dimensions
Overall length
31’ 8”9.66 m
Hull length
30’ 6”9.3 m
Waterline length
29’ 2”8.89 m
Beam (width)
11’ 1”3.39 m
Draft
7’ 1”2.17 m
Draft when appendages up
3’ 1”0.95 m
Mast height from DWL
46’ 7”14.2 m
Light displacement (MLC)
10692 lb4850 kg
Ballast weight
2191 lb994 kg
Ballast type
Cast iron exterior ballast with steel centerboard
Océanis 31's rig and sails
Upwind sail area
530 ft²49.2 m²
Downwind sail area
1287 ft²119.6 m²
Mainsail area
265 ft²24.6 m²
Genoa area
265 ft²24.6 m²
Symmetric spinnaker area
1023 ft²95 m²
Asymmetric spinnaker area
643 ft²59.7 m²
I
iFore triangle height (from mast foot to fore stay top attachment)38’ 8”11.8 m
J
iFore triangle base (from mast foot to bottom of forestay)12’3.67 m
P
iMainsail hoist measurement (from tack to head)35’ 10”10.9 m
E
iMainsail foot measurement (from tack to clew)12’ 10”3.9 m
Rigging type
Sloop Marconi fractional
Mast configuration
Deck stepped mast
Rotating spars
No
Number of levels of spreaders
1
Spreaders angle
Swept-back
Spars construction
Aluminum spars
Standing rigging
1x19 strand wire continuous
Océanis 31'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.185 ft²/T17.17 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.449 ft²/T41.74 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.195
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.20 %
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 1.34.7.24 knots
Océanis 31's auxiliary engine
Engine(s)
1 inboard engine
Engine(s) power
21 HP
Fuel type
Diesel
Fuel tank capacity
34.3 gal130 liters
Océanis 31's accommodations and layout
Cockpit
Closed aft cockpit
Cabin(s)
2
Berth(s) (min./max.)
4 / 6
Head(s)
1
Freshwater tank capacity
34.3 gal130 liters
Holding tank capacity
21.1 gal80 liters
Fridge/ice-box capacity
26.4 gal100 liters
Boiler capacity
6.6 gal25 liters
Maximum headroom
6’ 1”1.85 m
Galley headroom
5’ 10”1.77 m
Head headroom
6’1.84 m
Océanis 31's saloon
Maximum headroom
5’ 10”1.77 m
Océanis 31's fore cabin
Maximum headroom
5’ 10”1.77 m
Berth length
6’ 8”2.03 m
Berth width (head/feet)
5’ 5”1.64 m / 1’ 1”0.34 m
Océanis 31's aft cabin
Maximum headroom
6’1.84 m
Berth length
7’ 4”2.24 m
Berth width (head/feet)
5’ 6”1.69 m / 5’ 6”1.69 m
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