Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Long Keel
Rigging Type: Fractional Sloop
LOA: 30.08 ft
LWL: 24.67 ft
S.A. (reported): 408.00 ft²
Beam: 7.67 ft
Displacement: 9,000.00 lb
Ballast: 4,600.00 lb
Max Draft: 5.25 ft
Construction: Wood
First Built: 1923
# Built: 30
Builder: Madden & Lewis (USA)
Designer: Fred C.Brewer / Alden & Associates

KLSC Leaderboard

KLSC Leaderboard

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

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 20.25 ft
J: 9.50 ft
P: 32.00 ft
E: 20.50 ft
S.A. Fore: 96.19 ft²
S.A. Main: 328.00 ft²
S.A. Total (100% Fore + Main Triangles): 424.19 ft²
S.A./Displ. (calc.): 15.74
Est. Forestay Length: 22.37 ft

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)