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Ss One Ton 1966
Designer: Sparkman & Stephens  ·  Builder: Clare Lallow (Uk)/Carlini  ·  First built: 1966
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About the Ss One Ton 1966

Emerging from the competitive racing scene of the mid-1960s, the Ss One Ton 1966 represents a significant chapter in offshore sailboat history. Built to the One Ton Cup rating rule, this vessel was designed with performance at the forefront, making it a compelling option for sailors interested in vintage racing craft or spirited offshore passages. As a One Ton class boat, it was conceived to be sailed hard and raced competitively, with design priorities centered around speed, stability, and responsiveness under a variety of wind conditions. These characteristics also translate well to capable coastal and offshore cruising, offering a lively sailing experience that rewards skilled handling. With limited specifications readily available, much of what defines this boat rests in its historical context and the enduring legacy of the One Ton class itself, which pushed yacht designers to refine hull forms and sail plans during a transformative era in ocean racing. For buyers drawn to classic pedigree and performance-oriented design, the Ss One Ton 1966 carries the character and heritage of an era when racing shaped the very future of sailboat design.

Core Dimensions
LOA (Length Overall) 36.50 ft / 11.13 m
LWL (Waterline Length) 26.58 ft / 8.10 m
Beam 9.92 ft / 3.02 m
Max Draft 6.16 ft / 1.88 m
Displacement 12,470.00 lb / 5,656 kg
Ballast 5,500.00 lb / 2,495 kg
Sail Area (Reported) 495.00 ft² / 45.99 m²
Design & Construction
Hull Type Fin with rudder on skeg
Rigging Type Masthead Sloop
Construction Wood Planked
Designer Sparkman & Stephens
Builder Clare Lallow (UK)/Carlini
First Built 1966
Last Built 1975
Related Sailboats ["Swan 37" · "Hallberg Rassy 35" · "Islander 37" · "Pearson 36" · "Ct 37"]
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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
 14.78
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
 30.69
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
 1.71
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. 6.91
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. 942.13
How It Compares

vs. Hallberg Rassy 35, Islander 37, Pearson 36

This boat Similar boats
Dimensions
LOA
Ss One Ton 1966 ★
36.5 ft
Hallberg Rassy 35
36.5 ft
Islander 37
36.5 ft
Pearson 36
36.6 ft
LWL
Ss One Ton 1966 ★
26.6 ft
Hallberg Rassy 35
28.1 ft
Islander 37
28.3 ft
Pearson 36
29.2 ft
Beam
Ss One Ton 1966 ★
9.9 ft
Hallberg Rassy 35
10.0 ft
Islander 37
10.8 ft
Pearson 36
11.1 ft
Displacement
Ss One Ton 1966 ★
12 lbs
Hallberg Rassy 35
12 lbs
Islander 37
14 lbs
Pearson 36
13 lbs
Ballast
Ss One Ton 1966 ★
5 lbs
Hallberg Rassy 35
—
Islander 37
5 lbs
Pearson 36
6 lbs
Sail Area
Ss One Ton 1966 ★
495 sq ft
Hallberg Rassy 35
450 sq ft
Islander 37
605 sq ft
Pearson 36
601 sq ft
Performance
PHRF Rating (lower = faster)
Ss One Ton 1966 ★
—
Hallberg Rassy 35
—
Islander 37
153 s/nm
Pearson 36
138 s/nm
SA / Displacement (higher = more powerful)
Ss One Ton 1966 ★
14.8
Hallberg Rassy 35
13.7
Islander 37
16.7
Pearson 36
17.0
Comfort Ratio (higher = more comfortable offshore)
Ss One Ton 1966 ★
30.7
Hallberg Rassy 35
28.5
Islander 37
29.4
Pearson 36
27.0
Capsize Screening (lower = safer)
Ss One Ton 1966 ★
1.71
Hallberg Rassy 35
1.74
Islander 37
1.80
Pearson 36
1.86
Displacement / Length (lower = lighter)
Ss One Ton 1966 ★
—
Hallberg Rassy 35
244
Islander 37
274
Pearson 36
—
Hull Speed
Ss One Ton 1966 ★
6.9 kts
Hallberg Rassy 35
7.1 kts
Islander 37
7.1 kts
Pearson 36
7.2 kts
Speed Number (higher = faster)
Ss One Ton 1966 ★
—
Hallberg Rassy 35
1.9
Islander 37
1.9
Pearson 36
2.2
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