Design and Production
The Corby 25’s story began in 2000, when the original custom boat was built in strip cedar for Dublin-based Mike Guinan. Moulds were taken from its hull and deck before fitting out. Harley Racboats built three boats from those moulds before the tooling moved to Latvia.
Partington Marine in Wales later acquired the moulds and produced the most recent example. Approximately 20 Corby 25s were built across this dispersed production history. The design therefore spans a custom one-off origin and several small production runs rather than a single, continuous factory line.
Construction and Hull Form
The Corby 25 has a solid fibreglass hull, a fin keel with a bulb, and a spade rudder. It measures 25 feet overall, with a waterline length of roughly 23 feet, an 8.2-foot beam, and displacement near 4,630 pounds. Its length-to-beam ratio is 3.05.
Ballast is 2,425 pounds of lead, producing a ballast ratio of 52 percent. Wetted surface is about 247 square feet, while the immersion rate is approximately 656 pounds per inch. As a result, the hull responds visibly to crew and gear loads. Draft is near 6.1 feet, which restricts access to shallow marinas.
Rig and Performance
The fractional rig carries a sail-area-to-displacement ratio of 25.98. Combined with a displacement-length ratio of 171, that places the Corby 25 among light racers. Its theoretical hull speed is 6.4 knots.
Control lines are sized on a practical offshore-racer scale. The jib and genoa sheets are 25 feet long and 3/8 inch in diameter. The mainsheet is 62.5 feet long in the same diameter, while the spinnaker sheet measures 55 feet at 3/8 inch.
The capsize screening value is 1.97, and the Motion Comfort Ratio is 18.3. These figures are consistent with a stiff, quick hull tuned for performance rather than sedate cruising. The design’s famously successful record supports its competitive credibility.
Accommodations
The Corby 25 is a performance-oriented small sailboat rather than a spacious cruiser. Its light-racer classification sets the expectations for an interior shaped by the race-cruise brief, with performance taking priority over accommodation volume.
The Verdict
The Corby 25 is a compact, thoroughly modern light-displacement racer with a competitive pedigree and an easily driven, bulb-keel hull. Its scattered production history means each example may reflect variations between builders. Even so, the core design figures—a high ballast ratio, low displacement-length ratio, and healthy sail-area-to-displacement ratio—describe a boat built to move.
For sailors looking for a small, quick fractional sloop with serious racing credibility, the Corby 25 remains a compelling choice.
Pros
- Famously successful design with a competitive record
- Light-racer displacement-length and sail-area ratios that support lively performance
- 52 percent ballast ratio, with lead ballast and a bulb fin keel
- Fractional rig with practical offshore-spec sheet sizes
Cons
- Limited, scattered production across several builders
- Compact interior shaped by the race-cruise brief rather than a spacious cruising layout
- Draft near 6.1 feet restricts access to shallow marinas
