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Interclub Usa
Designer: Sparkman & Stephens  ·  Builder: O'day Corp. (Usa)  ·  First built: 1946
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About the Interclub Usa

Originally designed by the renowned Sparkman & Stephens firm in 1946, this compact centerboard dinghy represents classic American small boat design from the post-war era. Built by O'Day Corporation, the Interclub Usa embodies the traditional approach to sailing education and recreational day sailing that defined mid-20th century boating culture. At just over 11 feet in length with a generous beam of nearly five feet, this wood and fiberglass construction dinghy offers remarkable stability for its size. The cat-rigged Marconi sail plan keeps things simple while providing adequate power with 72 square feet of sail area. The 150-pound displacement makes it light enough for easy handling and car-top transport, while the 3-foot draft centerboard configuration allows exploration of shallow waters. With a hull speed of 4.54 knots, the Interclub Usa is well-suited for protected waters, sailing instruction, and leisurely day sailing rather than serious racing or coastal passages. The low comfort ratio of 2.65 and moderate capsize screening value of 3.45 indicate this is fundamentally a fair-weather boat best enjoyed in calm conditions. Its Sparkman & Stephens pedigree ensures sound design principles, making it an excellent choice for beginning sailors or those seeking a classic, uncomplicated sailing experience.

Core Dimensions
LOA (Length Overall) 11.50 ft / 3.51 m
LWL (Waterline Length) 11.50 ft / 3.51 m
Beam 4.58 ft / 1.40 m
Max Draft 3.00 ft / 0.91 m
Min Draft 0.20 ft / 0.06 m
Displacement 150.00 lb / 68 kg
Sail Area (Reported) 72.00 ft² / 6.69 m²
Design & Construction
Hull Type Centerboard Dinghy
Rigging Type Cat (Marconi)
Construction Wood/FG
Designer Sparkman & Stephens
Builder O'Day Corp. (USA)
First Built 1946
Associations Interclub Dinghy Class
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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
 40.83
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
 44.03
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
 2.65
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
 3.45
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. 4.54 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. 188.20 pounds/inch
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