Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Long Keel
Rigging Type: Fractional Sloop
LOA: 9.17 m
LWL: 7.52 m
S.A. (reported): 37.90 m²
Beam: 2.34 m
Displacement: 4,082 kg
Ballast: 2,087 kg
Max Draft: 1.60 m
Construction: Wood
First Built: 1923
# Built: 30
Builder: Madden & Lewis (USA)
Designer: Fred C.Brewer / Alden & Associates

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Sailboat Calculations

S.A. / Displ.: 15.14
Bal. / Displ.: 51.11
Disp: / Len: 267.60
Comfort Ratio: 35.05
Capsize Screening Formula: 1.48
S#: 1.90
Hull Speed: 6.66 kn
Pounds/Inch Immersion: 676.10 pounds/inch

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Rig and Sail Particulars

I: 6.17 m
J: 2.90 m
P: 9.75 m
E: 6.25 m
S.A. Fore: 8.94 m²
S.A. Main: 30.47 m²
S.A. Total (100% Fore + Main Triangles): 39.41 m²
S.A./Displ. (calc.): 15.74
Est. Forestay Length: 6.82 m

Sailboat Links

Designers: John G. Alden
Samuel Crocker
Download Boat Record:


Fred C. Brewer, a naval architect from Sausalito, California did the preliminary design work with Sam Crocker of Alden Associates, drawing the final plans. (Alden design #157) Originally called the San Francisco 'S' class, it became known as the BIRD when some of the first boats were given bird names. A number of the original boats still exist and race as a fleet to this day on San Francisco Bay. (2008)