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Sailboat Specifications

Triangle One Design

Fractional Sloop · Fin Keel

Designed by John Alden · Built by James Graves · First built 1926

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LOA 28.50 ft  ·  Beam 7.50 ft  ·  Displacement 5,017.00 lb  ·  Sail Area 407.00 ft²  ·  Fractional Sloop  ·  Fin Keel
About the Triangle One Design Sailboat

Designed with competitive one-design racing in mind, the Triangle One Design is a class-focused sailboat built to deliver consistent, fair racing on the water. As a one-design vessel, every boat in the class is built to the same specifications, meaning results come down to sailor skill rather than equipment advantage — a quality that appeals strongly to racing enthusiasts looking for a level playing field. While detailed specifications are limited in available records, the Triangle One Design's very name suggests a boat well-suited to triangular windward-leeward course racing, a classic format that tests tacking, gybing, and strategic decision-making. This type of sailing typically favors responsive, nimble hulls that reward precise sail trim and tactical awareness. For those researching a potential purchase, the Triangle One Design may appeal most to sailors interested in active class racing within an established fleet. Prospective buyers are encouraged to seek out local class associations, as one-design boats often live and die by the health of their racing community. A strong local fleet can make ownership especially rewarding, offering regular competition and a ready network of fellow sailors.

Dimensions & Specifications
LOA (Length Overall) 28.50 ft / 8.69 m
LWL (Waterline Length) 18.50 ft / 5.64 m
Beam 7.50 ft / 2.29 m
Max Draft 4.75 ft / 1.45 m
Displacement 5,017.00 lb / 2,276 kg
Ballast 2,500.00 lb / 1,134 kg
Sail Area (Reported) 407.00 ft² / 37.81 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Fractional Sloop
Construction Wood
Designer John Alden
Builder James Graves
First Built 1926
Last Built 1933
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Frequently Asked Questions

What is the Triangle One Design's sail area to displacement ratio?

The Triangle One Design has a Sail Area to Displacement ratio (SA/D) of 22.29. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Triangle One Design's comfort ratio?

The Triangle One Design has a Ted Brewer Comfort Ratio of 24.62. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Triangle One Design safe for offshore sailing?

The Triangle One Design has a Capsize Screening Formula value of 1.75. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Triangle One Design?

The theoretical hull speed of the Triangle One Design is 5.76 knots, calculated from its waterline length.

How much does a Triangle One Design weigh?

The Triangle One Design has a displacement of 5,017.00 lb and a length overall (LOA) of 28.50 ft.

Who designed the Triangle One Design?

The Triangle One Design was designed by John Alden, first built in 1926.