B-31
Sailboat
30′ 7″
Since 1973
Overview
- Model
- B-31
- Type
- Sailboat
- Built
- 1973–1988
- Designer
- Bruno Boström/Grandinsson
- Hull
- Fin with rudder on skeg
- Hull material
- Fiberglass
- Rig
- Masthead Sloop
Dimensions
- Length overall
- 30′ 7″ (9.33 m)
- Waterline length
- 26′ (7.92 m)
- Beam
- 9′ 1″ (2.77 m)
- Displacement
- 7,782 lb (3,530 kg)
- Ballast
- 3,748 lb (1,700 kg)
Sails and rig
- Sail area
- 382 sq ft (35.5 m²)
- I (foretriangle height)
- 37′ 5″ (11.40 m)
- J (foretriangle base)
- 12′ (3.65 m)
- P (mainsail luff)
- 31′ 10″ (9.70 m)
- E (mainsail foot)
- 9′ 2″ (2.80 m)
Design ratios
- Sail area / displacement
- 15.6
- Displacement / length
- 198
- Ballast ratio
- 48%
- Capsize screening
- 1.84
Power from the sails for the boat's weight. Under 16 is modest, 16–20 a typical cruiser, over 20 lively.
How heavy the boat is for its waterline. Under 200 is light, 200–300 moderate, over 300 heavy.
Share of the weight that is ballast. Higher generally means stiffer in a breeze.
Under 2 is generally considered better for offshore use.
More details
- Ballast Type
- Iron
- Construction
- FG
Data from Mauri Pro Sailboat Data. Check details with the builder before relying on them.