Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin w/spade rudder
Rigging Type: Masthead Sloop
LOA: 28.00 ft
LWL: 22.50 ft
S.A. (reported): 400.00 ft²
Beam: 9.50 ft
Displacement: 7,600.00 lb
Ballast: 3,000.00 lb
Max Draft: 4.50 ft
Construction: FG
Ballast Type: Lead
First Built: 1980
Last Built: 1983
# Built: 103
Builder: S-2 Yachts
Designer: Arthur Edmunds

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Yanmar
Model: 1GM
Type: Diesel
HP: 8
Fuel: 18 gals


Water: 37 gals
Headroom: 6.00 ft

Sailboat Calculations

S.A. / Displ.: 16.61
Bal. / Displ.: 39.47
Disp: / Len: 297.86
Comfort Ratio: 24.24
Capsize Screening Formula: 1.94
S#: 1.70
Hull Speed: 6.36 kn
Pounds/Inch Immersion: 763.75 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 37.00 ft
J: 11.00 ft
P: 31.00 ft
E: 12.00 ft
S.A. Fore: 203.50 ft²
S.A. Main: 186.00 ft²
S.A. Total (100% Fore + Main Triangles): 389.50 ft²
S.A./Displ. (calc.): 16.17
Est. Forestay Length: 38.60 ft
Mast Height from DWL: 41.00 ft

Sailboat Links

Designers: Arthur Edmunds
Builders: S2 Yachts (USA)
Download Boat Record:


Also called the 8.5A
A few early boats were fitted with a BMW diesel.
Shoal draft: 3.92'.