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Sailboat Specifications

Shellfish

Masthead Sloop · Fin With Rudder On Skeg

Designed by Francois Sergent · Built by Cnso (Fra) · First built 1965

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LOA 28.71 ft  ·  Beam 8.20 ft  ·  Displacement 4,850.00 lb  ·  Sail Area 344.98 ft²  ·  Masthead Sloop  ·  Fin With Rudder On Skeg
About the Shellfish Sailboat

Designed by François Sergent and first launched in 1965, this French-built sailboat represents classic European craftsmanship from the golden era of wooden boat construction. The Shellfish emerged during a period when designers were transitioning from traditional full-keel configurations to more modern fin-keel designs, evident in its fin keel with rudder on skeg arrangement. With its moderate displacement of 4,850 pounds and substantial ballast ratio, the Shellfish strikes a balance between performance and stability that makes it well-suited for coastal cruising and weekend sailing. The masthead sloop rig provides straightforward sail handling, while the boat's dimensions create a comfortable interior for its size class. Built by CNSO in France, these boats showcase traditional wooden construction techniques that were hallmarks of French boatbuilding in the 1960s. The design's comfort ratio of 17.74 indicates a relatively stiff, quick-motion boat that responds well in varying conditions, while the capsize screening value of 1.94 suggests good stability characteristics for coastal waters. With a hull speed of 6.60 knots and sail area-to-displacement ratio of 19.32, the Shellfish offers respectable performance for cruising sailors who appreciate classic wooden boat character with modern underwater design elements.

Dimensions & Specifications
LOA (Length Overall) 28.71 ft / 8.75 m
LWL (Waterline Length) 24.28 ft / 7.40 m
Beam 8.20 ft / 2.50 m
Max Draft 4.59 ft / 1.40 m
Displacement 4,850.00 lb / 2,200 kg
Ballast 1,764.00 lb / 800 kg
Ballast Type Cast iron
Sail Area (Reported) 344.98 ft² / 32.05 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction Wood
Designer Francois Sergent
Builder CNSO (FRA)
First Built 1965
Related Sailboats Ericson 29 · Seafarer 29 · Ranger 29 Mull · Aloa 29 · Ohlson 88
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Frequently Asked Questions

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

The Shellfish has a Sail Area to Displacement ratio (SA/D) of 19.32. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Shellfish's comfort ratio?

The Shellfish has a Ted Brewer Comfort Ratio of 17.74. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Shellfish safe for offshore sailing?

The Shellfish has a Capsize Screening Formula value of 1.94. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Shellfish?

The theoretical hull speed of the Shellfish is 6.60 kn knots, calculated from its waterline length.

How much does a Shellfish weigh?

The Shellfish has a displacement of 4,850.00 lb and a length overall (LOA) of 28.71 ft.

Who designed the Shellfish?

The Shellfish was designed by Francois Sergent, first built in 1965.