Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
8.9 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 44.5′, the Najad 520 Ds tops out around 8.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √44.5′ LWL = 8.9 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Ballast / Displacement
34.0%
Typical cruising ballast — balanced stability and motion underway.
Hull Speed
8.9kts
PHRF Fleet Position
Where the Najad 520 Ds sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Baltic 52
Swan 51
How It Compares
Side-by-side with the boats most often cross-shopped against the Najad 520 Ds.
| Najad 520 Ds | Baltic 52 | Nauticat 52 | Swan 51 | Sweden Yachts 52 | Xc 50 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 51.8 | 52.5 | 51.2 | 51.3 | 52.0 | 51.2 |
| LWL | 44.5 | 43.1 | 39.6 | 42.3 | 41.3 | 44.3 |
| Beam | 15.1 | 15.4 | 15.0 | 14.7 | 14.3 | 15.1 |
| Displacement | 44 | 31 | 56 | 39 | 33 | 35 |
| Ballast | 14 | 13 | 15 | 16 | 13 | 15 |
| Sail Area | — | 1 | — | 1 | 1 | 1 |
| Performance | ||||||
| PHRF | — | 15 | — | 36 | — | — |
| SA/Disp | — | 20.9 | — | 17.9 | 25.1 | 20.3 |
| Bal/Disp | 34.0 | 41.4 | 27.1 | 41.7 | — | 44.9 |
| Comfort | — | 28.1 | — | 38.0 | 34.1 | 31.8 |
| Capsize | — | 1.95 | — | 1.73 | 1.77 | 1.84 |
| Hull Speed | — | 8.8 | — | 8.7 | 8.6 | 8.9 |