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IRWIN 28 MK IV
Built by Irwin Yachts (USA)
• Designed by Ted Irwin
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General Information
Hull Type:
Fin with rudder on skeg
Rigging Type:
Masthead Sloop
First Built:
1976
Last Built:
1981
Dimensions
Length Overall (LOA):
8.66 m
Length Waterline (LWL):
7.01 m
Beam:
2.74 m
Draft (Max):
1.37 m
Weight & Ballast
Displacement:
3,538 kg
Ballast:
1,451 kg
Ballast Type:
Lead
Sail Plan
Foresail Area:
20.62 m²
Mainsail Area:
14.34 m²
Sail Area:
34.97 m²
Sail Area (reported):
35.02 m²
I (Fore Triangle Height):
11.28 m
J (Fore Triangle Base):
3.66 m
P (Mainsail Hoist):
9.65 m
E (Boom Length):
2.97 m
Est. Forestay Length:
11.86 m
Engine & Systems
Performance Ratios
Hull Speed:
6.43 knots
SA/Displacement (Calc):
15.36
SA/Displacement (Reported):
15.39
Ballast/Disp Ratio:
41.03%
Displacement/Length:
286.20
Comfort Ratio:
26.22
Capsize Screening:
1.82
S-Number:
1.72
Immersion:
132 kg/cm
Notes
Keel/CB version also available.
Market Value
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