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Comet 770
Designer: Groupe Finot  ·  Builder: Comar (Ita)  ·  First built: 1973
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About the Comet 770

Designed by the renowned French firm Groupe Finot and built by Italian manufacturer Comar during the mid-1970s, this 25-foot sailboat represents European design thinking from sailing's golden era. The Comet 770's moderate dimensions and fiberglass construction made it an accessible entry point into serious sailing for its time. With a fin keel and skeg-mounted rudder configuration, the boat strikes a balance between performance and stability that suited both weekend coastal cruising and club racing. The masthead sloop rig provides straightforward sail handling, while the substantial ballast-to-displacement ratio of nearly 44% ensures good stability and seaworthiness for a boat this size. The design's comfort ratio of 15.05 indicates a relatively stiff, quick motion that favors performance over easy cruising, making it well-suited for day sailing and short coastal passages rather than extended live-aboard cruising. The capsize screening value suggests reasonable offshore capability when properly handled, though the boat's size and vintage equipment would limit most owners to coastal waters. Groupe Finot's reputation for creating fast, seaworthy designs is evident in the Comet 770's proportions, offering sailors of the era a taste of French design philosophy in an accessible package that could handle both competitive sailing and recreational coastal exploration.

Core Dimensions
LOA (Length Overall) 25.25 ft / 7.70 m
LWL (Waterline Length) 18.50 ft / 5.64 m
Beam 8.67 ft / 2.64 m
Max Draft 4.75 ft / 1.45 m
Displacement 3,550.00 lb / 1,610 kg
Ballast 1,550.00 lb / 703 kg
Sail Area (Reported) 335.00 ft² / 31.12 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Groupe Finot
Builder Comar (ITA)
First Built 1973
Last Built 1978
Owner Reviews

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Performance Ratios
SA/Displacement Sail Area to Displacement ratio measures how much sail power a boat has relative to its weight. Higher values mean more performance and speed.
Under 14 — Heavy cruiser, slow14–18 — Cruising sailboat18–22 — Cruiser/racerOver 22 — Performance racer
23.09
Ballast/Displacement Ballast to Displacement ratio shows what percentage of the boat's total weight is ballast. Higher values generally mean better initial stability and stiffer sail carrying.
30–35% — Typical cruiser35–45% — Stiff performance boatOver 45% — Racing oriented
43.66
Displacement/Length Displacement to Length ratio measures how heavy a boat is relative to its waterline length. Lower values mean a lighter, faster boat.
Under 100 — Ultralight racer100–200 — Light cruiser/racer200–300 — Moderate cruiser300–400 — Heavy cruiserOver 400 — Very heavy
250.3
Comfort Ratio Ted Brewer's Comfort Ratio predicts how comfortable a boat will feel in offshore conditions. Higher values mean a steadier, more comfortable motion in a seaway.
Under 20 — Uncomfortably rough20–30 — Acceptable coastal30–40 — Good offshore comfortOver 40 — Very comfortable offshore
15.05
Capsize Screening Formula The USHS Capsize Screening Formula estimates offshore capsize risk. Lower is safer — values under 2.0 are considered acceptable for offshore sailing.
Under 2.0 — Safe for offshore2.0–2.2 — Borderline offshoreOver 2.2 — Coastal use recommended
2.28
Hull Speed Hull Speed is the theoretical maximum speed of a displacement hull, calculated from waterline length. Most cruising sailboats reach this speed in moderate conditions. 5.76 kn
Pounds/Inch Immersion Pounds per Inch Immersion (PPI) tells you how much weight is needed to sink the boat one inch. Useful for calculating how additional gear and stores affect waterline. 573.11 pounds/inch
Engine & Accommodations
Engine Make Faryman
Engine Type Diesel
Horsepower 7.5
Fuel Capacity 7 gals / 26 L
Water Capacity 14 gals / 53 L
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