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Topaz Uno
Designer: Ian Howlett/Rob White  ·  Builder: Topper International  ·  First built: 2011
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About the Topaz Uno

Designed by the collaborative team of Ian Howlett and Rob White, this compact dinghy represents a modern approach to accessible sailing. Built by Topper International since 2011, the Topaz Uno utilizes advanced TRILAM polyethylene construction, offering exceptional durability while keeping maintenance requirements minimal compared to traditional fiberglass dinghies. At just over 12 feet in length with a modest beam, this single-handed dinghy strikes an excellent balance between stability and performance. The fractional sloop rig with free-standing mast simplifies rigging and reduces setup time, making it particularly appealing for sailing schools, youth programs, and recreational sailors seeking hassle-free sailing. The daggerboard configuration provides versatility across varying water depths while maintaining good upwind performance. With its lightweight displacement of 132 pounds, the Topaz Uno is easily transported and launched, opening up numerous sailing venues from protected harbors to inland lakes. The generous sail area relative to displacement delivers responsive performance in light to moderate conditions, while the capsize screening formula indicates this boat is purpose-built for protected waters rather than open ocean sailing. This dinghy excels as a day sailor for coastal waters, training vessel, or recreational boat for sailors wanting an uncomplicated yet engaging sailing experience.

Core Dimensions
LOA (Length Overall) 12.66 ft / 3.86 m
Beam 4.76 ft / 1.45 m
Displacement 132.00 lb / 60 kg
Sail Area (Reported) 79.55 ft² / 7.39 m²
Design & Construction
Hull Type Dbrd. Dinghy
Rigging Type Frac. Sloop (Free standing)
Construction TRILAM Polyethylene
Designer Ian Howlett/Rob White
Builder Topper International
First Built 2011
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Performance Ratios
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
47.29
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
2.24
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. 4.4 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. 1.1 pounds/inch
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