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Sailboat Specifications

Neptune 550

Fractional Sloop · Swing Keel

Designed by Jacques Fauroux · Built by Neptune Domazan · First built 1979

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LOA 18.04 ft  ·  Beam 8.04 ft  ·  Displacement 1,190.00 lb  ·  Sail Area 183.00 ft²  ·  Fractional Sloop  ·  Swing Keel
About the Neptune 550 Sailboat

Designed by Jacques Fauroux and built by Neptune Domazan from 1979 to 1990, this compact French cruiser represents thoughtful European design philosophy in an 18-foot package. With 200 hulls produced during its eleven-year production run, the Neptune 550 gained a following among sailors seeking a capable small cruiser with distinctive features. The boat's most notable characteristic is its swing keel configuration, which reduces draft for shallow-water exploration while maintaining sailing performance when deployed. This versatility makes it particularly well-suited for coastal cruising, gunkholes, and protected waters where fixed-keel boats might struggle. The fractional sloop rig provides balanced sail handling, while the generous beam of just over 8 feet creates surprising interior volume for its compact length. At 1,190 pounds displacement with 330 pounds of ballast, the Neptune 550 offers reasonable stability for weekend cruising and day sailing. The comfort ratio of 6.55 suggests a relatively quick motion in a seaway, typical of lighter displacement designs, making it better suited for protected waters than serious offshore work. With a sail area to displacement ratio of 26.12, the boat should perform well in light to moderate conditions, offering spirited sailing performance for crews seeking an engaging small cruiser.

Dimensions & Specifications
LOA (Length Overall) 18.04 ft / 5.50 m
LWL (Waterline Length) 17.22 ft / 5.25 m
Beam 8.04 ft / 2.45 m
Max Draft 3.61 ft / 1.10 m
Min Draft 0.98 ft / 0.30 m
Displacement 1,190.00 lb / 540 kg
Ballast 330.00 lb / 150 kg
Sail Area (Reported) 183.00 ft² / 17.00 m²
Design & Construction
Hull Type Swing Keel
Rigging Type Fractional Sloop
Construction FG
Designer Jacques Fauroux
Builder Neptune Domazan
First Built 1979
Last Built 1990
Number Built 200
Associations Micro Class (IMCCA)
Related Sailboats Edel 2 · Hunter 18 · Catalina 18 · Swift 18 · Capri 18 Catalina
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Frequently Asked Questions

What is the Neptune 550's sail area to displacement ratio?

The Neptune 550 has a Sail Area to Displacement ratio (SA/D) of 26.12. Values between 14–18 are typical cruising sailboats; 18–22 is cruiser/racer; over 22 is performance racing.

What is the Neptune 550's comfort ratio?

The Neptune 550 has a Ted Brewer Comfort Ratio of 6.55. A ratio over 30 indicates good offshore comfort; over 40 is very comfortable offshore.

Is the Neptune 550 safe for offshore sailing?

The Neptune 550 has a Capsize Screening Formula value of 3.04. Values under 2.0 are considered acceptable for offshore sailing; under 1.8 is ideal.

What is the hull speed of the Neptune 550?

The theoretical hull speed of the Neptune 550 is 5.56 kn knots, calculated from its waterline length.

How much does a Neptune 550 weigh?

The Neptune 550 has a displacement of 1,190.00 lb and a length overall (LOA) of 18.04 ft.

Who designed the Neptune 550?

The Neptune 550 was designed by Jacques Fauroux, first built in 1979.