Detailed sailboat specifications and datasheets since 2015
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Bénéteau 31 Deep draft

Sailboat specifications

The Bénéteau 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 Deep draft version offers a deeper L-shaped keel bringing extra performance especially upwind.

The Bénéteau 31 has also been marketed as Océanis 31 and she is as well listed, on Boat-Specs.com, in Shoal draft and Keel and centerboard version (see all the versions compared).

Bénéteau 31's main features

Model
Bénéteau 31
Version
Deep draft
Hull type
Monohull
Category
Cruising sailboat
Sailboat builder
Sailboat designer
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
Keel : fin with bulb
Helm
Single helm wheel
Rudder
Single spade rudder
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 < 0,5m
B
Standard public price ex. VAT (indicative only)
About 
78 000
 (2017)

Bénéteau 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
5’ 11”1.8 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

Bénéteau 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

Bénéteau 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

Bénéteau 31's auxiliary engine

Engine(s)
1 inboard engine
Engine(s) power
21 HP
Fuel type
Diesel
Fuel tank capacity
34.3 gal130 liters

Bénéteau 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

Bénéteau 31's saloon

Maximum headroom
5’ 10”1.77 m

Bénéteau 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

Bénéteau 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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