Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
5.6 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 17.7′, the Roy 20 tops out around 5.6 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √17.7′ LWL = 5.6 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
159
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
5.6kts
Pounds/Inch Immersion
3lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the Roy 20 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Ranger 20
Cal 20
Balboa 20
Ensenada 20
How It Compares
Side-by-side with the boats most often cross-shopped against the Roy 20.
| Roy 20 | Balboa 20 | Cal 20 | Ensenada 20 | Ranger 20 | Windrose 20 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 20.0 | 20.0 | 20.0 | 20.0 | 20.0 | 20.0 |
| LWL | 17.7 | 17.5 | 18.0 | 17.5 | 16.0 | 16.0 |
| Beam | 7.2 | 7.1 | 7.0 | 7.1 | 7.9 | 7.5 |
| Displacement | 1 | 1 | 1 | 1 | 1 | 1 |
| Ballast | — | 450 | 900 | 550 | 550 | — |
| Sail Area | — | — | 195 | — | — | — |
| Performance | ||||||
| PHRF | — | 276 | 258 | 291 | 240 | — |
| SA/Disp | — | — | 20.0 | — | — | — |
| Bal/Disp | — | 26.5 | — | 34.4 | 36.7 | — |
| Comfort | — | — | 12.1 | — | — | — |
| Capsize | — | — | 2.24 | — | — | — |
| Hull Speed | — | — | 5.7 | — | — | — |