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Sailboat Specifications

Flatfish

Fractional Sloop · Keel/Cbrd.

Designed by Herreshoff/Joel White · Built by Fairey Marine Ltd. / O'day · First built 1960

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LOA 20.25 ft  ·  Beam 7.50 ft  ·  Displacement 3,094.00 lb  ·  Sail Area 266.00 ft²  ·  Fractional Sloop  ·  Keel/Cbrd.
About the Flatfish Sailboat

Originally designed by the legendary Nathanael Herreshoff and later refined by renowned naval architect Joel White, the Flatfish represents a thoughtful blend of classic yacht design principles with practical cruising capabilities. This 20-foot fractional sloop emerged in 1960 through builders Fairey Marine Ltd. and O'Day, combining traditional wood construction with fiberglass elements. With her generous beam of 7.5 feet and substantial displacement of 3,094 pounds, the Flatfish offers impressive stability and interior volume for her size. The keel/centerboard configuration provides versatility, allowing access to shallow waters while maintaining good windward performance when the board is deployed. Her moderate draft of 4.25 feet strikes an excellent balance between shoal water capability and sailing efficiency. The boat's sail-area-to-displacement ratio of 20.1 indicates spirited performance in light to moderate conditions, while the comfortable 18.83 comfort ratio suggests she's well-suited for extended coastal cruising rather than aggressive racing. Her low capsize screening value of 2.06 reflects the inherent stability that made these designs popular among families and cruising sailors. The Flatfish excels as a weekender for protected waters and near-coastal exploration, offering the charm of classic design with practical sailing characteristics.

Dimensions & Specifications
LOA (Length Overall) 20.25 ft / 6.17 m
LWL (Waterline Length) 16.08 ft / 4.90 m
Beam 7.50 ft / 2.29 m
Max Draft 4.25 ft / 1.30 m
Min Draft 2.16 ft / 0.66 m
Displacement 3,094.00 lb / 1,403 kg
Sail Area (Reported) 266.00 ft² / 24.71 m²
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Fractional Sloop
Construction Wood/FG
Designer Herreshoff/Joel White
Builder Fairey Marine Ltd. / O'Day
First Built 1960
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Frequently Asked Questions

What is the Flatfish's sail area to displacement ratio?

The Flatfish has a Sail Area to Displacement ratio (SA/D) of 20.1. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Flatfish's comfort ratio?

The Flatfish has a Ted Brewer Comfort Ratio of 18.83. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Flatfish safe for offshore sailing?

The Flatfish has a Capsize Screening Formula value of 2.06. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Flatfish?

The theoretical hull speed of the Flatfish is 5.37 kn knots, calculated from its waterline length.

How much does a Flatfish weigh?

The Flatfish has a displacement of 3,094.00 lb and a length overall (LOA) of 20.25 ft.

Who designed the Flatfish?

The Flatfish was designed by Herreshoff/Joel White, first built in 1960.