B-31 (BOSTROM)

Sailboat Specifications

both imperial metric

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

Definitions

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

help

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

Sailboat Links

Designers:

Bruno Boström

Download Boat Record:

PDF

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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