The Class 6 is aggressively canvassed for its weight.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
10.7 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 63.3′, the Class 6 tops out around 10.7 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √63.3′ LWL = 10.7 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
37.6
Performance-oriented — carries a lot of canvas for its weight.
Displacement / Length
54
Ultralight — responsive and fast, but carries less stores.
Hull Speed
10.7kts
Estimated Speed by Wind
Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.
| Point of Sail | 6 kts TWS | 10 kts TWS | 15 kts TWS | 20 kts TWS |
|---|---|---|---|---|
| Close-hauled40–50° | 5.0 | 6.4 | 7.1 | 7.4 |
| Close Reach60° | 6.1 | 7.7 | 8.6 | 9.0 |
| Beam Reach90° | 7.5 | 9.4 | 10.6 | 11.5 |
| Broad Reach120–135° | 6.9 | 8.7 | 9.8 | 10.6 |
| Run150–180° | 5.5 | 7.0 | 7.8 | 8.1 |
These are simplified estimates based on hull speed (10.7 kts),
SA/D (37.6), and empirical efficiency curves — not instrument-measured
polars. Real-world speed varies with sea state, bottom condition, sail trim, and current.
Speeds in gold approach hull speed;
bold gold means near or at hull speed.
Wind Range & Comfort Envelope
Estimated wind ranges for comfortable sailing on the Class 6 — based on sail area, ballast, and displacement characteristics.
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–16 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
16–24 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
24+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.
How It Compares
Side-by-side with the boats most often cross-shopped against the Class 6.
| Class 6 | Alegria 67 | Exploration 60 Garcia | Hh 66 | Privilege 580 | Swan 65 Frers | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 64.0 | 66.8 | 64.0 | 65.9 | 61.2 | 66.0 |
| LWL | 63.3 | — | 55.0 | 65.0 | 59.0 | 60.3 |
| Beam | 29.5 | 32.3 | 17.7 | 28.5 | 30.1 | 18.4 |
| Displacement | 30 | 77 | 77 | 39 | 63 | 60 |
| Ballast | — | — | 21 | — | — | 14 |
| Sail Area | 2 | 2 | — | 2 | — | — |
| Performance | ||||||
| SA/Disp | 37.6 | 22.0 | 0.7 | 34.6 | 13.0 | — |
| Bal/Disp | — | — | 27.6 | — | — | 24.1 |
| Comfort | — | — | 45.0 | 10.7 | 17.6 | — |
| Capsize | — | — | 1.67 | 3.35 | 3.02 | — |
| Hull Speed | — | — | 9.9 | 10.8 | 10.3 | — |