Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 35.50 ft
LWL: 29.50 ft
S.A. (reported): 623.00 ft²
Beam: 11.42 ft
Displacement: 13,500.00 lb
Ballast: 6,900.00 lb
Max Draft: 6.33 ft
Construction: FG
Ballast Type: Lead
First Built: 1974
# Built: 80
Builder: Jeremy Rogers (UK)
Designer: Doug Peterson

KLSC Leaderboard

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Sailboat Calculations

S.A. / Displ.: 17.64
Bal. / Displ.: 51.11
Disp: / Len: 234.76
Comfort Ratio: 26.01
Capsize Screening Formula: 1.92
S#: 2.39
Hull Speed: 7.28 kn
Pounds/Inch Immersion: 1,203.75 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 48.50 ft
J: 15.50 ft
P: 43.00 ft
E: 11.50 ft
S.A. Fore: 375.88 ft²
S.A. Main: 247.25 ft²
S.A. Total (100% Fore + Main Triangles): 623.13 ft²
S.A./Displ. (calc.): 17.65
Est. Forestay Length: 50.92 ft

Sailboat Links

Designers: Doug Peterson
Builders: Jeremy Rogers Ltd.
Associations: One Ton Class
Download Boat Record:


Designed as IOR (MKIII) 1 ton. Prototype (Gumboots) was winner of the 1974 International One Ton cup.
Shown here is the race version.