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Gemini Cape Cod
Designer: Sidney Herreshoff  ·  Builder: Cape Cod Shipbuilding (Usa)  ·  First built: 1955
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About the Gemini Cape Cod

Designed by the renowned Sidney Herreshoff in 1955, this compact fractional sloop represents classic New England craftsmanship from Cape Cod Shipbuilding. With only 150 hulls produced, the Gemini Cape Cod has earned a reputation as a well-built daysailer that exemplifies traditional wooden boat construction enhanced by fiberglass components. At just over 16 feet, this shoal-draft design features twin centerboards that make it ideal for exploring shallow coastal waters, harbors, and protected bays. The generous beam of 5.58 feet provides surprising stability for such a compact hull, while the modest displacement of 440 pounds allows for easy launching and retrieval. The boat's SA/Displacement ratio of 38.77 indicates lively performance in light to moderate conditions, making it an excellent choice for recreational sailing and informal racing. The Gemini Cape Cod excels as a daysailer for small crews or families seeking an authentic sailing experience. Its comfortable cockpit and responsive handling make it particularly suitable for sailing instruction or leisurely afternoon sails. While not designed for extended cruising or offshore work, this boat shines in protected waters where its shallow draft and traditional lines can be fully appreciated by sailors who value classic design and proven seaworthiness.

Core Dimensions
LOA (Length Overall) 16.08 ft / 4.90 m
LWL (Waterline Length) 14.75 ft / 4.50 m
Beam 5.58 ft / 1.70 m
Max Draft 3.33 ft / 1.01 m
Min Draft 0.58 ft / 0.18 m
Displacement 440.00 lb / 200 kg
Sail Area (Reported) 140.00 ft² / 13.01 m²
Design & Construction
Hull Type Twin Centerboards
Rigging Type Fractional Sloop
Construction Wood/FG
Designer Sidney Herreshoff
Builder Cape Cod Shipbuilding (USA)
First Built 1955
Number Built 150
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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
 38.77
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
 61.21
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
 4.54
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
 2.94
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. 5.15 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. 294.08 pounds/inch
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