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B-31 (BOSTROM)

Masthead Sloop • Fin with rudder on skeg • Built 1973–1988

Dimensions

LOA
30.64 ft
LWL
25.98 ft
Beam
9.06 ft
Max Draft
5.91 ft
Displacement
7,782 lbs
Ballast
3,748 lbs

Performance Ratios

Capsize Ratio ⓘ
1.83 (offshore safe)
SA/D Ratio ⓘ
15.1
D/L Ratio ⓘ
198
Ballast Ratio ⓘ
48.2%

Sail Plan

Sail Area
370 sq ft
I
37.4 ft
J
11.98 ft
P
31.82 ft
E
9.19 ft

Construction

Hull Type
Fin with rudder on skeg
Rig Type
Masthead Sloop
Hull Material
FG
Ballast Type
Iron

Production

First Built
1973
Last Built
1988
Number Built
1000

Engine & Accommodations

Engine Make
Yanmar
Power
8 hp
Engine Type
Diesel
Notes:

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

Designer