Beta Marine

Beta Marine

Sailboat Specifications

Hull Type: Fin with rudder on skeg
Rigging Type: Masthead Sloop
LOA: 11.28 m
LWL: 9.14 m
S.A. (reported): 51.84 m²
Beam: 3.51 m
Displacement: 8,165 kg
Ballast: 3,039 kg
Max Draft: 1.68 m
Construction: FG
First Built: 1971
Last Built: 1975
Builder: Irwin Yachts (USA)
Designer: Ted Irwin

KLSC Leaderboard

KLSC Leaderboard

Auxiliary Power/Tanks (orig. equip.)

Make: Perkins
Model: 4-107
Type: Diesel
HP: 40
Fuel: 303 L


Water: 189 L

Sailboat Calculations

S.A. / Displ.: 13.05
Bal. / Displ.: 37.22
Disp: / Len: 297.62
Comfort Ratio: 33.51
Capsize Screening Formula: 1.76
S#: 1.43
Hull Speed: 7.34 kn
Pounds/Inch Immersion: 1,232.72 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

I: 12.80 m
J: 4.37 m
P: 10.82 m
E: 4.42 m
S.A. Fore: 27.96 m²
S.A. Main: 23.91 m²
S.A. Total (100% Fore + Main Triangles): 51.87 m²
S.A./Displ. (calc.): 13.06
Est. Forestay Length: 13.53 m

Sailboat Links

Designers: Ted Irwin
Builders: Irwin Yachts
Associations: Irwin Facebook Group
Irwin Yacht Owners
Related Sailboats: IRWIN 37-5
IRWIN 37-3
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The IRWIN 37 was promoted as a no compromise cruising boat.
Introduced in 1971 it was one of this builders most successful models though undergoing numerous changes until production ended in 1982. It's been said that nearly nearly 600 were sold.
Available as sloop, cutter or ketch.
Shoal draft fixed keel: 4.92'
Keel/cb version: (draft: 4.0' board up)
Also available with a 50 HP Perkins 4-108
IRWIN 37-2 (1976 - bowsprit added which continued for all remaining models.)
IRWIN 37-3
IRWIN 37-4 (1977)
IRWIN 37-5 (1982 last model year).