| Main features | Bénéteau 31 Deep draft |
Model | Bénéteau 31 |
Version | Deep draft |
Hull type | Monohull |
Category | Cruising sailboat |
Sailboat builder | Bénéteau |
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) | 93480 2017 |
| Main dimensions | Bénéteau 31 Deep draft |
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 |
| Rig and sails | Bénéteau 31 Deep draft |
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 |
| Performances | Bénéteau 31 Deep draft |
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 |
| Auxiliary engine | Bénéteau 31 Deep draft |
Engine(s) | 1 inboard engine |
Engine(s) power | 21 HP |
Fuel type | Diesel |
Fuel tank capacity | 34.3 gal130 liters |
| Accommodations and layout | Bénéteau 31 Deep draft |
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 |
| Saloon | Bénéteau 31 Deep draft |
Maximum headroom | 5’ 10”1.77 m |
| Fore cabin | Bénéteau 31 Deep draft |
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 |
| Aft cabin | Bénéteau 31 Deep draft |
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 |