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Yachting World Catamaran
Designer: Rod Macalpine-Downie  ·  Builder: Sail Craft Ltd. (Uk)  ·  First built: 1964
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About the Yachting World Catamaran

Designed by Rod Macalpine-Downie and first launched in 1964, this compact catamaran represents an early venture into affordable multihull sailing by UK builder Sail Craft Ltd. At just over 15 feet in length with a 7-foot beam, this fiberglass twin-daggerboard design offers an accessible entry point into catamaran sailing for those seeking speed and excitement on the water. The fractional sloop rig configuration provides excellent sail handling characteristics, while the impressive sail area-to-displacement ratio of 72.57 reveals this boat's performance-oriented nature. With only 240 pounds of displacement spread across twin hulls, the Yachting World Catamaran delivers the exhilarating acceleration and planning capabilities that multihulls are renowned for. This design is ideally suited for day sailing, coastal exploration, and small boat racing. The shallow 2.83-foot draft opens up access to beaches and shallow waters that deeper monohulls cannot reach. While the compact size limits overnight cruising capabilities, the boat excels as a spirited day sailer for those who prioritize speed and maneuverability. The twin daggerboard configuration allows for excellent upwind performance while maintaining the ability to beach easily when desired.

Core Dimensions
LOA (Length Overall) 15.50 ft / 4.72 m
Beam 7.00 ft / 2.13 m
Max Draft 2.83 ft / 0.86 m
Min Draft 0.25 ft / 0.08 m
Displacement 240.00 lb / 109 kg
Sail Area (Reported) 175.00 ft² / 16.26 m²
Design & Construction
Hull Type Catamaran Twin Dbrd.
Rigging Type Fractional Sloop
Construction FG
Designer Rod MacAlpine-Downie
Builder Sail Craft Ltd. (UK)
First Built 1964
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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
 72.57
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
 46.85
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
 1.99
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
 4.51
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. 4.86 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. 1.98 pounds/inch
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