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Supercat 19
Designer: Steve Edmunds/Bill Roberts  ·  Builder: Boston Whaler /Aquarius Sail Inc. (Usa)  ·  First built: 1985
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About the Supercat 19

Designed by the collaboration of Steve Edmunds and Bill Roberts, this compact catamaran represents an interesting entry into the small multihull market from the mid-1980s. Built by Boston Whaler and Aquarius Sail Inc., the Supercat 19 combines the stability advantages of twin hulls with a manageable size for trailering and single-handed sailing. The fractional sloop rig with rotating spar delivers impressive sail-carrying ability, as evidenced by the substantial sail-to-displacement ratio of 80.09. This configuration suggests the boat was designed with performance in mind, offering exciting sailing in moderate conditions while maintaining the inherent stability that catamarans provide. The twin daggerboard setup allows for excellent upwind performance and shallow-water versatility. At just 375 pounds displacement, this lightweight catamaran can plane easily in fresh breezes, making it ideal for day sailing, sailing instruction, or small boat racing. The fiberglass construction ensures durability while keeping maintenance requirements reasonable. The boat's compact 19-foot length makes it perfect for coastal waters, protected bays, and lakes where its shallow three-foot draft opens up anchorages unavailable to deeper-draft monohulls. This design appeals to sailors seeking catamaran performance without the complexity of larger multihulls.

Core Dimensions
LOA (Length Overall) 19.00 ft / 5.79 m
LWL (Waterline Length) 18.75 ft / 5.72 m
Beam 8.00 ft / 2.44 m
Max Draft 3.00 ft / 0.91 m
Min Draft 1.00 ft / 0.30 m
Displacement 375.00 lb / 170 kg
Sail Area (Reported) 260.00 ft² / 24.15 m²
Design & Construction
Hull Type Catamaran Twin Dbrd.
Rigging Type Frac. Sloop (Rotating Spar)
Construction FG
Designer Steve Edmunds/Bill Roberts
Builder Boston Whaler /Aquarius Sail Inc. (USA)
First Built 1985
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Performance Ratios
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
1.92
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
4.44
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. 5.8 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. 3.21 pounds/inch
Engine & Accommodations
KSP 1.8
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