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Belfast Lough One Design Class I
Designer: William Fife Jr.  ·  Builder: John Hildtich  ·  First built: 1898
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About the Belfast Lough One Design Class I

Emerging from the competitive sailing waters of Northern Ireland's Belfast Lough, this one-design sailboat represents a fascinating piece of regional sailing heritage. Class I vessels were specifically created to provide closely matched racing within the sheltered waters of Belfast Lough, where consistent wind patterns and challenging tidal conditions demanded boats with particular handling characteristics. One-design classes like this were developed to emphasize sailing skill over boat modifications, ensuring fair competition among local sailors. The Belfast Lough setting would have influenced the design toward a boat capable of handling the lough's notorious choppy conditions and variable winds that funnel through the surrounding hills. While detailed specifications remain elusive, boats from this era and region typically featured robust construction suited to the demanding Irish sailing environment. The Class I designation suggests this was part of a tiered racing system, likely representing either the premier class or entry-level category within the local fleet. For contemporary sailors interested in classic one-design racing or those drawn to boats with authentic regional character, the Belfast Lough One Design Class I offers a connection to Ireland's rich small-boat racing tradition, though finding examples today would require dedicated searching among classic boat enthusiasts.

Core Dimensions
LOA (Length Overall) 37.25 ft / 11.35 m
LWL (Waterline Length) 25.00 ft / 7.62 m
Beam 8.67 ft / 2.64 m
Max Draft 6.25 ft / 1.91 m
Displacement 26,800.00 lb / 12,156 kg
Ballast 7,380.00 lb / 3,348 kg
Sail Area (Reported) 848.00 ft² / 78.78 m²
Design & Construction
Hull Type Fin Keel
Rigging Type Cutter
Construction Wood
Designer William Fife Jr.
Builder John Hildtich
First Built 1898
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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
15.21
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
81.31
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
1.16
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. 6.7
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. 774.47
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