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B-31 (BOSTROM)
• Designed by Bruno Boström/Grandinsson
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General Information
Hull Type:
Fin with rudder on skeg
Rigging Type:
Masthead Sloop
First Built:
1973
Last Built:
1988
Number Built:
1000
Dimensions
Length Overall (LOA):
9.34 m
Length Waterline (LWL):
7.92 m
Beam:
2.76 m
Draft (Max):
1.80 m
Weight & Ballast
Displacement:
3,530 kg
Ballast:
1,700 kg
Ballast Type:
Iron
Sail Plan
Foresail Area:
20.81 m²
Mainsail Area:
13.58 m²
Sail Area:
34.40 m²
Sail Area (reported):
34.37 m²
I (Fore Triangle Height):
11.40 m
J (Fore Triangle Base):
3.65 m
P (Mainsail Hoist):
9.70 m
E (Boom Length):
2.80 m
Est. Forestay Length:
11.97 m
Engine & Systems
Engine Make:
Yanmar
Engine Type:
Diesel
Engine Power:
8 HP
Performance Ratios
Hull Speed:
6.83 knots
SA/Displacement (Calc):
15.13
SA/Displacement (Reported):
15.12
Ballast/Disp Ratio:
48.16%
Displacement/Length:
198.12
Comfort Ratio:
23.32
Capsize Screening:
1.83
S-Number:
2.50
Immersion:
150 kg/cm
Notes
Derived from the earlier Bostrum designed MARKAT 30. Also known as BOSTRUM 31. Most were sold as bare hulls or kits.
Market Value
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