Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 30.00 ft
LWL: 26.92 ft
S.A. (reported): 474.00 ft²
Beam: 10.17 ft
Displacement: 10,000.00 lb
Ballast: 4,600.00 lb
Max Draft: 5.33 ft
Construction: FG
First Built: 1972
Builder: Irwin Yachts (USA)
Designer: Ted Irwin

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Universal
Model: Atomic 4
Type: Gas
Fuel: 20 gals


Water: 50 gals

Sailboat Calculations

S.A. / Displ.: 16.39
Bal. / Displ.: 46.00
Disp: / Len: 228.84
Comfort Ratio: 25.27
Capsize Screening Formula: 1.89
S#: 2.32
Hull Speed: 6.95 kn
Pounds/Inch Immersion: 978.23 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 41.70 ft
J: 13.50 ft
P: 35.00 ft
E: 11.00 ft
S.A. Fore: 281.48 ft²
S.A. Main: 192.50 ft²
S.A. Total (100% Fore + Main Triangles): 473.98 ft²
S.A./Displ. (calc.): 16.39
Est. Forestay Length: 43.83 ft

Sailboat Links

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


IOR 1/2 ton based on IRWIN 30.
Shoal draft version also available.