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Sailboat Specifications

Irwin 31 Citation

Masthead Sloop · Fin W/Spade Rudder

Designed by Ted Irwin · Built by Irwin Yachts (Usa) · First built 1983

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LOA 31.25 ft  ·  Beam 11.00 ft  ·  Displacement 9,300.00 lb  ·  Sail Area 474.00 ft²  ·  Masthead Sloop  ·  Fin W/Spade Rudder
About the Irwin 31 Citation Sailboat

Built by Irwin Yachts beginning in 1983, the Citation represents Ted Irwin's approach to creating an affordable coastal cruiser that balances comfort with reasonable sailing performance. This 31-foot masthead sloop features the era's popular fin keel and spade rudder configuration, delivering predictable handling characteristics that appeal to both novice and experienced sailors. With a displacement of 9,300 pounds and moderate sail area of 474 square feet, the Citation prioritizes stability and ease of handling over racing performance. The beam of 11 feet provides generous interior volume, while the 6-foot draft offers good directional stability without limiting access to most coastal anchorages. The comfort ratio of 21.11 reflects the boat's design philosophy, emphasizing livability for extended coastal cruising rather than lightweight performance. The Citation's fiberglass construction and straightforward systems make it an attractive option for sailors seeking a reliable platform for weekend getaways and coastal exploration. While not intended for serious offshore passages, this design handles typical coastal conditions with confidence. The masthead sloop rig keeps sail handling simple, and the spade rudder provides responsive steering. For sailors prioritizing comfort, affordability, and ease of maintenance over cutting-edge performance, the Citation delivers solid value in the competitive 31-foot cruiser market.

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Dimensions & Specifications
LOA (Length Overall) 31.25 ft / 9.53 m
LWL (Waterline Length) 26.50 ft / 8.08 m
Beam 11.00 ft / 3.35 m
Max Draft 6.00 ft / 1.83 m
Displacement 9,300.00 lb / 4,218 kg
Ballast 3,400.00 lb / 1,542 kg
Sail Area (Reported) 474.00 ft² / 44.04 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Ted Irwin
Builder Irwin Yachts (USA)
First Built 1983
Associations Irwin Facebook Group
Owner Reviews

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Engine & Accommodations
Engine Make Yanmar
Engine Type Diesel
Horsepower 15
Frequently Asked Questions

What is the Irwin 31 Citation's sail area to displacement ratio?

The Irwin 31 Citation has a Sail Area to Displacement ratio (SA/D) of 17.21. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Irwin 31 Citation's comfort ratio?

The Irwin 31 Citation has a Ted Brewer Comfort Ratio of 21.11. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Irwin 31 Citation safe for offshore sailing?

The Irwin 31 Citation has a Capsize Screening Formula value of 2.1. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Irwin 31 Citation?

The theoretical hull speed of the Irwin 31 Citation is 6.90 kn knots, calculated from its waterline length.

How much does a Irwin 31 Citation weigh?

The Irwin 31 Citation has a displacement of 9,300.00 lb and a length overall (LOA) of 31.25 ft.

Who designed the Irwin 31 Citation?

The Irwin 31 Citation was designed by Ted Irwin, first built in 1983.