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 F 9A 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.
Hull Speed
7.3kts
PHRF Fleet Position
Where the F 9A sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Noelex 30
Harbor 30
Dehler 31
How It Compares
Side-by-side with the boats most often cross-shopped against the F 9A.
| F 9A | Dehler 31 | F 31 Sport Cruiser | Farr 30 Mumm 30 | Harbor 30 | Noelex 30 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 30.8 | 30.8 | 30.8 | 30.9 | 30.8 | 30.9 |
| LWL | 30.0 | 24.3 | 30.0 | 27.6 | 26.1 | 26.8 |
| Beam | 22.4 | 10.2 | 22.4 | 10.1 | 9.9 | 9.4 |
| Displacement | 3 | 7 | 3 | 4 | 7 | 4 |
| Ballast | — | 2 | — | 1 | 3 | 1 |
| Sail Area | — | 443 | 599 | 504 | 523 | 410 |
| Performance | ||||||
| PHRF | — | 162 | — | — | 120 | 119 |
| SA/Disp | — | 19.3 | 40.7 | 29.4 | 21.9 | 25.6 |
| Bal/Disp | — | — | — | 43.8 | — | 31.4 |
| Comfort | — | 18.9 | — | 11.3 | 19.8 | 11.5 |
| Capsize | — | 2.12 | — | 2.44 | 2.03 | 2.34 |
| Hull Speed | — | 6.6 | — | 7.0 | 6.9 | 6.9 |