Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 10.16 m
LWL: 8.47 m
S.A. (reported): 47.75 m²
Beam: 3.43 m
Displacement: 4,900 kg
Ballast: 1,814 kg
Max Draft: 1.80 m
Construction: FG
Ballast Type: Lead
First Built: 1978
Last Built: 1986
# Built: 100
Builder: BK Marin (SWE)
Designer: Rolf Magnusson

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Volvo Penta
Model: D1-30
Type: Diesel
HP: 23
Fuel: 61 L


Water: 98 L

Sailboat Calculations

S.A. / Displ.: 16.89
Bal. / Displ.: 37.03
Disp: / Len: 224.71
Comfort Ratio: 22.57
Capsize Screening Formula: 2.04
S#: 2.42
Hull Speed: 7.06 kn
Pounds/Inch Immersion: 1,117.09 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 13.42 m
J: 4.20 m
P: 11.85 m
E: 3.30 m
S.A. Fore: 28.18 m²
S.A. Main: 19.56 m²
S.A. Total (100% Fore + Main Triangles): 47.74 m²
S.A./Displ. (calc.): 16.88
Est. Forestay Length: 14.06 m

Sailboat Links

Designers: Rolf Magnusson
Builders: BK Marin AB
Mamba Boats (SWE)
Associations: IOR 3/4 ton
Download Boat Record:


Designed as an IOR 3/4 ton. Also available with a frac. sloop rig.
An updated, more cruising oriented version called the MAMBA 341 was introduced in 1981.