Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 34.83 ft
LWL: 28.75 ft
S.A. (reported): 608.00 ft²
Beam: 10.42 ft
Displacement: 11,000.00 lb
Max Draft: 5.83 ft
Construction: FG
# Built: 400
Builder: John Duncanson
Designer: Allen Blackburne

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Sailboat Calculations

S.A. / Displ.: 19.74
Disp: / Len: 206.65
Comfort Ratio: 24.51
Capsize Screening Formula: 1.88
S#: 2.93
Hull Speed: 7.18 kn
Pounds/Inch Immersion: 1,070.41 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 41.50 ft
J: 14.00 ft
P: 57.75 ft
E: 11.00 ft
S.A. Fore: 290.50 ft²
S.A. Main: 317.63 ft²
S.A. Total (100% Fore + Main Triangles): 608.13 ft²
S.A./Displ. (calc.): 19.74
Est. Forestay Length: 43.80 ft

Sailboat Links

Related Sailboats: S&S 34
Download Boat Record:


While the following statement is unconfirmed, it is said Duncanson saw the first S&S 34 arrive in Adelaide AUS and took photographs to copy the hull and rig. He then tasked naval architect Allen Blackburne to work from the photos to come up with the design for the Duncanson 35.

Thanks to Dragos for information, specs and sail plan.