IRWIN 1/2 TON

IRWIN 1/2 TON

Beta Marine

Beta Marine

Sailboat Specifications

Definitions
Hull Type: Lifting Keel
Rigging Type: Masthead Sloop
LOA: 9.75 m
LWL: 7.44 m
S.A. (reported): 36.23 m²
Beam: 3.12 m
Displacement: 3,311 kg
Ballast: 907 kg
Max Draft: 1.98 m
Min Draft: 1.07 m
Construction: FG
Ballast Type: Lead
First Built: 1976
Builder: Irwin Yacht & Marine Corporation (USA)
Designer: Ted Irwin

Auxiliary Power/Tanks (orig. equip.)

Make: Volvo
Model: MB 2A
Type: Gas
Fuel: 23 L

Accomodations

Water: 45 L

Sailboat Calculations

Definitions
S.A. / Displ.: 16.63
Bal. / Displ.: 27.40
Disp: / Len: 223.79
Comfort Ratio: 19.04
Capsize Screening Formula: 2.12
S#: 2.40
Hull Speed: 6.62 kn
Pounds/Inch Immersion: 894.37 pounds/inch

calculation mobile

2 nd ad half width

3rd ad full width

Rig and Sail Particulars

HELP
I: 11.89 m
J: 3.66 m
P: 10.11 m
E: 2.87 m
S.A. Fore: 21.74 m²
S.A. Main: 14.51 m²
S.A. Total (100% Fore + Main Triangles): 36.25 m²
S.A./Displ. (calc.): 16.64
Est. Forestay Length: 12.44 m
Mast Height from DWL: 12.88 m

Sailboat Links

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

Notes

A shoal draft, fixed keel version was also available. Draft: 5.5'.