Beta Marine

Beta Marine

Sailboat Specifications

Definitions
Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 9.24 m
LWL: 6.71 m
S.A. (reported): 33.17 m²
Beam: 2.69 m
Displacement: 3,538 kg
Ballast: 1,542 kg
Max Draft: 1.65 m
Construction: FG
Ballast Type: Iron
First Built: 1968
Last Built: 1985
# Built: 350
Builder: IW-Varvet
Designer: Sparkman & Stephens

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Volvo Penta
Model: MD18
Type: Diesel
HP: 10

Sailboat Calculations

Definitions
S.A. / Displ.: 14.57
Bal. / Displ.: 43.59
Disp: / Len: 327.02
Comfort Ratio: 27.03
Capsize Screening Formula: 1.78
S#: 1.38
Hull Speed: 6.29 kn
Pounds/Inch Immersion: 694.11 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

HELP
I: 11.20 m
J: 3.48 m
P: 9.60 m
E: 2.85 m
S.A. Fore: 19.49 m²
S.A. Main: 13.68 m²
S.A. Total (100% Fore + Main Triangles): 33.17 m²
S.A./Displ. (calc.): 14.57
Est. Forestay Length: 11.73 m

Sailboat Links

Designers: Sparkman & Stephens
Builders: IW-Varvet (SWE)
Associations: Half Ton Class
IW-31 owners (in German)
Related Sailboats: SHE 31
Download Boat Record:

Notes

Based on RORC/IOR 1/2 ton proto.. S&S design #1899C. Similar to the SHE 31 by South Hants Engineering (UK).

MK I (1968 – 1972): small stern, 'dinette' layout.
MK II (1972 – 1980): larger stern, new deck, different wood trim.
MK III (1980 – 1985): aluminium toe rail (instead of Teak), glass hatch, different hardware.

Thanks to 'little wings' for providing additional information.
Most detailed information can be found at: www.iw-31.de (in German)