The Corsair F-31 is with a quick, snappy motion best suited to day sailing.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
7.3 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 30.0′, the Corsair F-31 tops out around 7.3 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √30.0′ LWL = 7.3 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Displacement / Length
64
Ultralight — responsive and fast, but carries less stores.
Comfort Ratio
3.1
Quick, snappy motion — better for day sails and racing than long passages.
Capsize Screening
5.72
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Hull Speed
7.3kts
Pounds/Inch Immersion
2,688lbs
Weight needed to sink the hull one inch — loading sensitivity.
Motion & Offshore Suitability
Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.
Comfort Ratio
3.1
Quick, snappy motion — better for day sails and racing than long passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
5.72
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Corsair F-31 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Catalina 30
How It Compares
Side-by-side with the boats most often cross-shopped against the Corsair F-31.
| Corsair F-31 | Catalina 30 | Gemini 105Mc | |
|---|---|---|---|
| Dimensions | |||
| LOA | 30.8 | 29.9 | 33.5 |
| LWL | 30.0 | 25.0 | 31.8 |
| Beam | 22.4 | 10.8 | 14.0 |
| Displacement | 3,850 | 10 | 8,000 |
| Ballast | — | 4 | — |
| Sail Area | — | 446 | 690 |
| Performance | |||
| PHRF | — | 180 | — |
| SA/Disp | — | 15.2 | 27.6 |
| Bal/Disp | — | 41.2 | — |
| Comfort | 3.1 | 24.9 | 11.3 |
| Capsize | 5.72 | 2.00 | 2.80 |
| Hull Speed | 7.3 | 6.7 | 7.6 |