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Sailboat Specifications

Irwin 37 1 Ton

Masthead Sloop · Fin W/Spade Rudder

Designed by Ted Irwin · Built by Irwin Yachts (Usa) · First built 1972

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LOA 37.00 ft  ·  Beam 11.67 ft  ·  Displacement 15,400.00 lb  ·  Sail Area 628.00 ft²  ·  Masthead Sloop  ·  Fin W/Spade Rudder
About the Irwin 37 1 Ton Sailboat

Designed by Ted Irwin in the early 1970s, this 37-footer represents a classic example of the performance-oriented cruising boats that emerged during sailing's golden age. Built by Irwin Yachts from 1972 onward, the design reflects the era's emphasis on combining racing-inspired hull forms with practical cruising amenities. The fin keel and spade rudder configuration, paired with a masthead sloop rig, delivers responsive handling and solid upwind performance. With nearly half her displacement carried as ballast, the boat offers reassuring stability for coastal and offshore passages. Her moderate beam and sleek waterline create an efficient hull form capable of maintaining good speeds in varied conditions. The comfort ratio of 28.11 suggests a design that prioritizes performance over pure cruising comfort, making her particularly appealing to sailors who enjoy spirited sailing without sacrificing liveability. Her capsize screening value indicates good stability characteristics for extended cruising, while the sail area to displacement ratio confirms her ability to move well in light to moderate winds. This Irwin strikes an excellent balance between cruising practicality and sailing performance, making her well-suited for coastal exploration, weekend racing, or longer passages where responsive handling and reliable speed matter as much as comfort below decks.

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Dimensions & Specifications
LOA (Length Overall) 37.00 ft / 11.28 m
LWL (Waterline Length) 30.00 ft / 9.14 m
Beam 11.67 ft / 3.56 m
Max Draft 6.30 ft / 1.92 m
Displacement 15,400.00 lb / 6,985 kg
Ballast 7,300.00 lb / 3,311 kg
Ballast Type Lead
Sail Area (Reported) 628.00 ft² / 58.34 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Ted Irwin
Builder Irwin Yachts (USA)
First Built 1972
Associations Irwin Facebook Group
Owner Reviews

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Engine & Accommodations
Engine Make Universal
Engine Model Atomic 4
Engine Type Gas
Horsepower 30
Frequently Asked Questions

What is the Irwin 37 1 Ton's sail area to displacement ratio?

The Irwin 37 1 Ton has a Sail Area to Displacement ratio (SA/D) of 16.29. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Irwin 37 1 Ton's comfort ratio?

The Irwin 37 1 Ton has a Ted Brewer Comfort Ratio of 28.11. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Irwin 37 1 Ton safe for offshore sailing?

The Irwin 37 1 Ton has a Capsize Screening Formula value of 1.88. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Irwin 37 1 Ton?

The theoretical hull speed of the Irwin 37 1 Ton is 7.34 kn knots, calculated from its waterline length.

How much does a Irwin 37 1 Ton weigh?

The Irwin 37 1 Ton has a displacement of 15,400.00 lb and a length overall (LOA) of 37.00 ft.

Who designed the Irwin 37 1 Ton?

The Irwin 37 1 Ton was designed by Ted Irwin, first built in 1972.