B-31 (BOSTROM)

Sailboat Specifications


Hull Type:
Fin with rudder on skeg
Rigging Type:
Masthead Sloop
LOA:
30.64 ft / 9.34 m
LWL:
25.98 ft / 7.92 m
Beam:
9.06 ft / 2.76 m
S.A. (reported):
370.00 ft2 / 34.37 m2
Draft (max):
5.91 ft / 1.80 m
Displacement:
7,782 lb / 3,530 kg
Ballast:
3,748 lb / 1,700 kg
S.A./Disp.:
15.12
Bal./Disp.:
48.16
Disp./Len.:
198.12
Construction:
FG
Ballast Type:
Iron
First Built:
1973
Last Built:
1988
# Built:
1000
Designer:
Bruno Boström/Grandinsson

Auxiliary Power/Tanks (orig. equip.)

Make:
Yanmar
Type:
Diesel
HP:
8

Sailboat Calculations

S.A./Disp.:
15.12
Bal./Disp.:
48.16
Disp./Len.:
198.12
Comfort Ratio:
23.32
Capsize Screening Formula:
1.83
S#:
2.50

Rig and Sail Particulars

I:
37.40 ft / 11.40 m
J:
11.98 ft / 3.65 m
P:
31.82 ft / 9.70 m
E:
9.19 ft / 2.80 m
S.A. Fore:
224.03 ft2 / 20.81 m2
S.A. Main:
146.21 ft2 / 13.58 m2
S.A. Total (100% Fore + Main Triangles)
370.24 ft2 / 34.40 m2
S.A./Disp. (calc.):
15.13
Est. Forestay Len.:
39.27 ft / 11.97 m

Notes

Derived from the earlier Bostrum designed MARKAT 30. Also known as BOSTRUM 31. Most were sold as bare hulls or kits.

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