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Irwin 37 1
Designer: Ted Irwin  ·  Builder: Irwin Yachts  ·  First built: 1971
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About the Irwin 37 1

Launched as part of Irwin Yachts' popular production line during the 1970s, this center-cockpit cruiser represents the Florida builder's commitment to affordable family sailing. The design emphasizes interior volume and comfort over pure performance, making it an attractive option for coastal cruising and extended live-aboard adventures. Built with a moderate displacement hull and fin keel configuration, the boat strikes a reasonable balance between sailing ability and stability. The center cockpit layout provides excellent separation between the main salon and aft cabin, creating a sense of privacy that appeals to cruising couples. Irwin's construction methods focused on keeping costs manageable while delivering a seaworthy platform capable of handling typical coastal conditions. The yacht's spacious interior showcases the builder's understanding of what recreational sailors value most: comfortable accommodations, adequate storage, and easy maintenance access. While not designed for serious offshore passages or racing applications, this model earned a solid reputation among weekend sailors and casual cruisers seeking dependable performance without breaking the budget. The design remains popular in the used boat market, particularly among sailors looking for their first larger cruising yacht.

Core Dimensions
LOA (Length Overall) 37.00 ft / 11.28 m
LWL (Waterline Length) 30.00 ft / 9.14 m
Beam 11.50 ft / 3.51 m
Max Draft 5.50 ft / 1.68 m
Displacement 18,000.00 lb / 8,165 kg
Ballast 6,700.00 lb / 3,039 kg
Sail Area (Reported) 558.00 ft² / 51.84 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Ted Irwin
Builder Irwin Yachts
First Built 1971
Last Built 1975
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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
13.05
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
33.51
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
1.76
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 7.34
S# (Speed Number) The Speed Number (S#) is a quick performance index. Higher values indicate a faster, more powerful design relative to its size.
Under 3.0 — Slow cruiser3.0–5.0 — Average cruiser5.0–7.0 — Performance cruiserOver 7.0 — Racer
1.43
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 1.0
Rig Dimensions
I (Foretriangle Height) 42.0
J (Foretriangle Base) 14.33
P (Mainsail Luff) 35.5
E (Mainsail Foot) 14.5
SA Fore 300.93
SA Main 257.38
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