Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
4.4 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 11.0′, the Moth International tops out around 4.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √11.0′ LWL = 4.4 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
19
Ultralight — responsive and fast, but carries less stores.
Hull Speed
4.4kts
Pounds/Inch Immersion
2lbs
Weight needed to sink the hull one inch — loading sensitivity.
How It Compares
Side-by-side with the boats most often cross-shopped against the Moth International.
| Moth International | Classic Moth | Europe International | Fd Future | Rs Neo | Topper | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 11.0 | 11.0 | 11.0 | 11.8 | 11.6 | 11.2 |
| LWL | 11.0 | — | 11.0 | — | — | — |
| Beam | 7.4 | 5.0 | 4.4 | 4.9 | 4.7 | 3.9 |
| Displacement | 57 | 75 | 99 | 165 | 183 | 99 |
| Sail Area | — | 72 | 76 | 51 | 64 | — |
| Performance | ||||||
| SA/Disp | — | 64.8 | 56.8 | 27.5 | 32.1 | — |
| Comfort | — | — | 1.9 | — | — | 2.5 |
| Capsize | — | 4.74 | 3.82 | 3.54 | 3.28 | — |
| Hull Speed | — | — | 4.4 | — | — | 4.1 |