Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Fractional Sloop
LOA: 31.00 ft
LWL: 24.61 ft
S.A. (reported): 473.61 ft²
Beam: 10.50 ft
Displacement: 6,614.00 lb
Max Draft: 5.58 ft
Construction: Wood (mahogany)
First Built: 1982
Last Built: 1984
# Built: 8
Builder: Länsivene Oy (FIN)
Designer: Matti Pulli

KLSC Leaderboard

KLSC Leaderboard

Sailboat Calculations

S.A. / Displ.: 21.57
Disp: / Len: 198.10
Comfort Ratio: 16.81
Capsize Screening Formula: 2.24
S#: 3.11
Hull Speed: 6.65 kn
Pounds/Inch Immersion: 923.31 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 34.45 ft
J: 10.50 ft
P: 38.71 ft
E: 13.78 ft
S.A. Fore: 180.86 ft²
S.A. Main: 266.71 ft²
S.A. Total (100% Fore + Main Triangles): 447.57 ft²
S.A./Displ. (calc.): 20.39
Est. Forestay Length: 36.01 ft
Mast Height from DWL: 45.93 ft

Sailboat Links

Designers: Matti Pulli
Builders: Länsivene Oy
Associations: MP Owners
Download Boat Record:


In 1989, an updated version of the 31 was built out of GRP. Only one was produced and called the MP 315. The transom was tilted slightly increasing the LOA to 9.7m / 31.82ft. It also had a masthead rig. More information can be found at: