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Polynesian Concept
Designer: Csk/Rudy Choy  ·  Builder: W. D. Schock Corp./Csk(Usa)  ·  First built: 1970
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About the Polynesian Concept

Designed by the legendary Rudy Choy and built by W. D. Schock Corp. from 1970 to 1972, this pioneering catamaran represents an important chapter in multihull development. With only twelve hulls produced during its brief production run, the Polynesian Concept stands as a rare example of early fiberglass catamaran construction. The boat's impressive 37-foot length overall paired with a generous 17-foot beam creates exceptional stability and spacious accommodations, while the twin daggerboard configuration provides excellent shallow-water performance and beaching capabilities. The masthead sloop rig carries 805 square feet of sail area, delivering spirited performance with the characteristic speed potential that made Choy's designs famous among multihull enthusiasts. At 5,500 pounds displacement, this catamaran offers the perfect balance between performance and load-carrying ability for extended coastal cruising or island hopping adventures. The sail area to displacement ratio of 41.46 indicates strong light-air performance, making it well-suited for tropical sailing conditions where it can truly shine. While production numbers were limited, the Polynesian Concept's Rudy Choy pedigree and Schock construction quality make it a sought-after vessel among vintage multihull collectors and serious cruising sailors seeking proven offshore capability.

Core Dimensions
LOA (Length Overall) 37.00 ft / 11.28 m
LWL (Waterline Length) 30.50 ft / 9.30 m
Beam 17.00 ft / 5.18 m
Min Draft 1.58 ft / 0.48 m
Displacement 5,500.00 lb / 2,495 kg
Sail Area (Reported) 805.00 ft² / 74.79 m²
Design & Construction
Hull Type Catamaran Twin Dbrd.
Rigging Type Masthead Sloop
Construction FG
Designer CSK/Rudy Choy
Builder W. D. Schock Corp./CSK(USA)
First Built 1970
Last Built 1972
Number Built 12
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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
41.46
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
5.97
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
3.86
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. 7.4 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. 11.11 pounds/inch
Engine & Accommodations
KSP 1.06
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