Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 40.00 ft
LWL: 32.50 ft
S.A. (reported): 771.00 ft²
Beam: 12.25 ft
Displacement: 20,000.00 lb
Ballast: 7,000.00 lb
Max Draft: 4.50 ft
Construction: FG
First Built: 1984
Last Built: 1988
Builder: Irwin Yachts (USA)
Designer: Ted Irwin

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Perkins
Model: 4-108
Type: Diesel
HP: 50
Fuel: 60 gals


Water: 140 gals

Sailboat Calculations

S.A. / Displ.: 16.81
Bal. / Displ.: 35.00
Disp: / Len: 260.09
Comfort Ratio: 31.62
Capsize Screening Formula: 1.81
S#: 2.06
Hull Speed: 7.64 kn
Pounds/Inch Immersion: 1,422.54 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 49.75 ft
J: 17.25 ft
P: 42.75 ft
E: 16.00 ft
S.A. Fore: 429.09 ft²
S.A. Main: 342.00 ft²
S.A. Total (100% Fore + Main Triangles): 771.09 ft²
S.A./Displ. (calc.): 16.81
Est. Forestay Length: 52.66 ft
Mast Height from DWL: 54.00 ft

Sailboat Links

Designers: Ted Irwin
Builders: Irwin Yachts
Associations: Irwin Facebook Group
Irwin Yacht Owners
Download Boat Record:


Keel-centerboard version - BU:4.5' BD:9.67'.
Also available with a 44 HP Yanmar 4JHBE.