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Sailboat Specifications

Seguin 40

Masthead Sloop · Keel/Cbrd.

Designed by Craig V. Walters · Built by Lyman Morse Boatbuilding (Usa) · First built 1983

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LOA 39.67 ft  ·  Beam 12.16 ft  ·  Displacement 17,200.00 lb  ·  Sail Area 753.00 ft²  ·  Masthead Sloop  ·  Keel/Cbrd.
About the Seguin 40 Sailboat

Designed by Craig V. Walters and built by the renowned Lyman Morse Boatbuilding, this rare 40-footer represents classic Maine craftsmanship from the early 1980s. With only five hulls constructed beginning in 1983, the Seguin 40 stands as an exclusive example of quality fiberglass construction combined with thoughtful design principles. The boat's substantial displacement of 17,200 pounds and impressive 50% ballast ratio create exceptional stability and seaworthiness, making it well-suited for serious coastal cruising and offshore passages. The deep 7.33-foot draft and keel/centerboard configuration provide excellent upwind performance while offering shallow-water versatility when the board is raised. With a moderate sail area-to-displacement ratio of 18.15 and comfortable 28.25 comfort ratio, this masthead sloop prioritizes seakindly motion and steady progress over pure speed. The low capsize screening value of 1.89 indicates strong stability characteristics that inspire confidence in challenging conditions. Lyman Morse's reputation for meticulous construction quality ensures these boats have aged gracefully. The Seguin 40 appeals to discerning sailors seeking a capable, well-built cruiser that balances performance with comfort, though its rarity means finding one requires patience and typically commands premium pricing.

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Dimensions & Specifications
LOA (Length Overall) 39.67 ft / 12.09 m
LWL (Waterline Length) 31.25 ft / 9.53 m
Beam 12.16 ft / 3.71 m
Max Draft 7.33 ft / 2.23 m
Min Draft 2.33 ft / 0.71 m
Displacement 17,200.00 lb / 7,802 kg
Ballast 8,600.00 lb / 3,901 kg
Ballast Type Lead
Sail Area (Reported) 753.00 ft² / 69.96 m²
Design & Construction
Hull Type Keel/Cbrd.
Rigging Type Masthead Sloop
Construction FG
Designer Craig V. Walters
Builder Lyman Morse Boatbuilding (USA)
First Built 1983
Number Built 5
Related Sailboats X 402 · J/39 · Cc 40 2 · Hunter 40 · North American 40
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Engine & Accommodations
Engine Type Diesel
Horsepower 22
Fuel Capacity 40 gals / 151 L
Water Capacity 120 gals / 454 L
Frequently Asked Questions

What is the Seguin 40's sail area to displacement ratio?

The Seguin 40 has a Sail Area to Displacement ratio (SA/D) of 18.15. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Seguin 40's comfort ratio?

The Seguin 40 has a Ted Brewer Comfort Ratio of 28.25. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Seguin 40 safe for offshore sailing?

The Seguin 40 has a Capsize Screening Formula value of 1.89. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Seguin 40?

The theoretical hull speed of the Seguin 40 is 7.49 kn knots, calculated from its waterline length.

How much does a Seguin 40 weigh?

The Seguin 40 has a displacement of 17,200.00 lb and a length overall (LOA) of 39.67 ft.

Who designed the Seguin 40?

The Seguin 40 was designed by Craig V. Walters, first built in 1983.