Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Lifting Keel
Rigging Type: Masthead Sloop
LOA: 9.75 m
LWL: 7.44 m
S.A. (reported): 38.28 m²
Beam: 3.45 m
Displacement: 3,311 kg
Ballast: 1,588 kg
Max Draft: 1.98 m
Min Draft: 1.07 m
Construction: FG
Ballast Type: Lead
First Built: 1977
Builder: Irwin Yacht & Marine Corporation (USA)
Designer: Ted Irwin

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Yanmar
Type: Diesel
HP: 12
Fuel: 53 L


Water: 106 L

Sailboat Calculations

S.A. / Displ.: 17.57
Bal. / Displ.: 47.95
Disp: / Len: 223.79
Comfort Ratio: 16.67
Capsize Screening Formula: 2.34
Hull Speed: 6.62 kn
Pounds/Inch Immersion: 988.60 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Sailboat Links

Designers: Ted Irwin
Builders: Irwin Yachts
Associations: Irwin Facebook Group
Irwin Yacht Owners
Related Sailboats: IRWIN 1/2 TON
Download Boat Record:


According to Irwin documentation, as compared to the first version, the MKII has a transom hung rudder, drop/dagger keel, (draft is the same) softer chine and broader beam aft.