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Ss 66
Designer: Sparkman & Stephens  ·  Builder: Aa Boats (Fin)  ·  First built: 1971
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About the Ss 66

Designed by the legendary naval architecture firm Sparkman & Stephens and built by Finnish yard Aa Boats starting in 1971, this 30-footer represents classic Scandinavian craftsmanship combined with proven American design principles. The Ss 66 features a moderate fin keel with rudder mounted on a protective skeg, providing good directional stability while maintaining reasonable performance characteristics. With a displacement of 7,716 pounds and nearly half that weight in ballast, this solidly-built fiberglass yacht offers reassuring stability for coastal cruising and short offshore passages. The comfortable beam of 9.28 feet provides reasonable interior space for a boat this size, while the substantial 5.48-foot draft ensures good upwind performance and tracking. The masthead sloop rig carries 451 square feet of sail area, delivering a moderate sail area-to-displacement ratio that favors reliability over pure speed. A low comfort ratio of 24.95 suggests this boat will move through waves rather than ride over them, typical of performance-oriented designs from this era. The excellent capsize screening value of 1.88 indicates strong stability characteristics suitable for serious coastal cruising and limited offshore work. This yacht appeals to sailors seeking a well-built, seaworthy vessel with classic lines and predictable handling characteristics.

Core Dimensions
LOA (Length Overall) 29.86 ft / 9.10 m
LWL (Waterline Length) 22.31 ft / 6.80 m
Beam 9.28 ft / 2.83 m
Max Draft 5.48 ft / 1.67 m
Displacement 7,716.00 lb / 3,500 kg
Ballast 3,740.00 lb / 1,696 kg
Ballast Type Lead
Sail Area (Reported) 451.00 ft² / 41.90 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction FG
Designer Sparkman & Stephens
Builder AA Boats (FIN)
First Built 1971
Associations Half Ton Class
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
 18.54
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
 48.47
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
 310.2
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
 24.95
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
 1.88
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. 6.33 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. 739.77 pounds/inch
Engine & Accommodations
Engine Make Vire
Engine Type Gas
Horsepower 7
Fuel Capacity 11 gals / 42 L
Water Capacity 22 gals / 83 L
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