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Sailboat specifications and datasheets

Bénéteau 31 keel and centerboard

The Bénéteau 31, here in "keel and centerboard" version, is a 30’6” monohull sailboat designed by Jean Marie Finot and Pascal Conq. She was built by Bénéteau (France) and made of monolithic fiberglass / polyester. The production started in 2007 .

The Bénéteau 31 has also been marketed as Océanis 31 and is as well listed, on Boat-Specs.com, in version Deep draft and Shoal draft.

Bénéteau 31 Bénéteau 31 sailplanBénéteau 31 sailingBénéteau 31 accommodationsBénéteau 31 accommodationsBénéteau 31 accommodationsBénéteau 31 accommodations
Bénéteau 31's   Main Features
Model Bénéteau 31
Version Keel and centerboard
Type of hull Monohull
Category Cruising sailboat
Shipyard
Designer Jean Marie Finot
Pascal Conq
Construction Hull:
monolithic fiberglass / polyester
Deck:
sandwich balsa / fiberglass / polyester
First built hull 2007
Last built hull Still in production
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) About
78 000
(2017)
Bénéteau 31's   Main dimensions
Length overall 31’ 8”
Hull length 30’ 6”
Waterline length 29’ 2”
Beam (width) 11’ 1”
Draft 7’ 1”
Draft when appendages up 3’ 1”
Mast height from DWL 46’ 7”
Light displacement 10692 lbs
Ballast weight 2191 lbs
Ballast type Cast iron exterior ballast with steel centerboard
Bénéteau 31's   Rig and sails
Upwind sail area 530 sq.ft
Downwind sail area 1287 sq.ft
Mainsail area 265 sq.ft
Genoa area 265 sq.ft
Symetric spinnaker area 1023 sq.ft
Asymetric spinnaker area 643 sq.ft
Rigging type Sloop Marconi fractional
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
IiFore triangle height (from mast foot to fore stay attachment) 38’ 8”
JiFore triangle base (from mast foot to bottom of forestay) 12’
PiMainsail hoist measurement (from tack to head) 35’ 10”
EiMainsail foot measurement (from tack to clew) 12’ 10”
Bénéteau 31'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.
17.17
Downwind 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.
41.74
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.
195
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.
20 %
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.
7.24 knots
Bénéteau 31's   Auxiliary engine
Engine(s) 1
Engine type Inboard engine
Engine 21 HP
Fuel type Diesel
Fuel tank capacity 34.3 gal
Bénéteau 31's   Accommodation
Cabin(s) 2
Berth(s) (min/max) 4 / 6
Head(s) 1
Fresh water tank capacity 34.3 gal
Water heater capacity 6.6 gal
Holding tank capacity 21.1 gal
Fridge/ice-box capacity 26.4 gal
Maximum headroom 6’ 1”
Galley headroom 5’ 10”
Head headroom 6’
Bénéteau 31's   Saloon
Maximum headroom 5’ 10”
Bénéteau 31's   Fore cabin
Maximum headroom 5’ 10”
Berth length 6’ 8”
Berth width (head/feet) 5’ 5”
1’ 1”
Bénéteau 31's   Aft cabin
Maximum headroom 6’
Berth length 7’ 4”
Berth width (head/feet) 5’ 6”

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