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Sailboat Specifications

Dragonfly One Design

Fractional Sloop · Centerboard Dinghy

Designed by George O'brien Kennedy · Built by Nunn Brothers (Uk) · First built 1946

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LOA 14.00 ft  ·  Beam 5.00 ft  ·  Displacement 225.00 lb  ·  Sail Area 125.00 ft²  ·  Fractional Sloop  ·  Centerboard Dinghy
About the Dragonfly One Design Sailboat

Designed by George O'Brien Kennedy in 1946, this classic wooden dinghy represents traditional British small boat craftsmanship at its finest. Built by Nunn Brothers using traditional clinker construction, only 63 examples of this fractional sloop-rigged centerboard dinghy were ever produced, making it a relatively rare find today. At 14 feet overall with a 13-foot waterline, the Dragonfly One Design strikes an elegant balance between manageable size and sailing performance. The 225-pound displacement keeps her light and responsive, while the generous 125 square feet of sail area provides spirited performance in moderate conditions. Her 5-foot beam offers reasonable stability for crew comfort, and the 4.5-foot draft with centerboard configuration allows exploration of shallow waters while maintaining good upwind ability. The boat's comfort ratio of 3.06 and capsize screening formula of 3.29 indicate she's best suited for protected waters, day sailing, and club racing rather than extended coastal passages. Her SA/displacement ratio of 54.11 suggests lively performance in light to moderate winds. The clinker-built hull construction showcases the traditional boatbuilding methods that defined British small craft of the era, appealing to sailors who appreciate classic wooden boat character and the maintenance traditions that come with it.

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Dimensions & Specifications
LOA (Length Overall) 14.00 ft / 4.27 m
LWL (Waterline Length) 13.00 ft / 3.96 m
Beam 5.00 ft / 1.52 m
Max Draft 4.50 ft / 1.37 m
Min Draft 0.67 ft / 0.20 m
Displacement 225.00 lb / 102 kg
Sail Area (Reported) 125.00 ft² / 11.61 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Fractional Sloop
Construction Wood (Clinker)
Designer George O'Brien Kennedy
Builder Nunn Brothers (UK)
First Built 1946
Number Built 63
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Frequently Asked Questions

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

The Dragonfly One Design has a Sail Area to Displacement ratio (SA/D) of 54.11. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Dragonfly One Design's comfort ratio?

The Dragonfly One Design has a Ted Brewer Comfort Ratio of 3.06. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Dragonfly One Design safe for offshore sailing?

The Dragonfly One Design has a Capsize Screening Formula value of 3.29. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Dragonfly One Design?

The theoretical hull speed of the Dragonfly One Design is 4.83 kn knots, calculated from its waterline length.

How much does a Dragonfly One Design weigh?

The Dragonfly One Design has a displacement of 225.00 lb and a length overall (LOA) of 14.00 ft.

Who designed the Dragonfly One Design?

The Dragonfly One Design was designed by George O'brien Kennedy, first built in 1946.