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Sailboat Specifications

Irwin 37 4

Cutter · Fin With Rudder On Skeg

Designed by Ted Irwin · Built by Irwin Yachts · First built 1977

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LOA 37.00 ft  ·  Beam 11.50 ft  ·  Displacement 20,000.00 lb  ·  Sail Area 627.00 ft²  ·  Cutter  ·  Fin With Rudder On Skeg
About the Irwin 37 4 Sailboat

Built during Irwin Yachts' productive era, this 37-footer represents the company's commitment to creating affordable cruising sailboats for the growing recreational sailing market. Irwin established a solid reputation for producing practical, well-built vessels that offered good value for coastal cruising and extended passages. This model likely features the classic Irwin characteristics that made the brand popular among cruising sailors: a spacious interior layout optimized for comfort, a moderate displacement hull designed for steady sailing performance, and construction quality that balanced durability with affordability. The design philosophy emphasized livability below decks while maintaining respectable sailing capabilities. The boat would be well-suited for coastal cruising, weekend sailing, and potentially longer passages in capable hands. Irwin's designs typically incorporated sensible deck layouts and rigging arrangements that made them manageable for couples or small crews. The hull form likely provides a good compromise between interior volume and sailing performance, making it an attractive option for sailors prioritizing comfort without sacrificing seaworthiness. For prospective buyers seeking a mid-sized cruiser with proven genetics and reasonable maintenance requirements, this Irwin model represents the brand's practical approach to recreational sailing vessel design.

Dimensions & Specifications
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 20,000.00 lb / 9,072 kg
Ballast 6,700.00 lb / 3,039 kg
Sail Area (Reported) 627.00 ft² / 58.25 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Cutter
Construction FG
Designer Ted Irwin
Builder Irwin Yachts
First Built 1977
Last Built 1982
Related Sailboats Endeavour 37 · Gulfstar 37 · Valiant 37 · Irwin 37 5 · Esprit 37
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Engine & Accommodations
Fuel Capacity 55
Water Capacity 187
Frequently Asked Questions

What is the Irwin 37 4's sail area to displacement ratio?

The Irwin 37 4 has a Sail Area to Displacement ratio (SA/D) of 13.67. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Irwin 37 4's comfort ratio?

The Irwin 37 4 has a Ted Brewer Comfort Ratio of 37.23. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Irwin 37 4 safe for offshore sailing?

The Irwin 37 4 has a Capsize Screening Formula value of 1.7. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Irwin 37 4?

The theoretical hull speed of the Irwin 37 4 is 7.34 knots, calculated from its waterline length.

How much does a Irwin 37 4 weigh?

The Irwin 37 4 has a displacement of 20,000.00 lb and a length overall (LOA) of 37.00 ft.

Who designed the Irwin 37 4?

The Irwin 37 4 was designed by Ted Irwin, first built in 1977.