Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
7.7 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 33.3′, the Sigma 400 tops out around 7.7 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √33.3′ LWL = 7.7 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
Ballast / Displacement
37.1%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
229
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
7.7kts
Pounds/Inch Immersion
9lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the Sigma 400 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
J/122
Tripp 40
How It Compares
Side-by-side with the boats most often cross-shopped against the Sigma 400.
| Sigma 400 | J/122 | Sabre 402 | Sun Fast 40 Jeanneau | Swan 40 Frers | Tripp 40 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 40.3 | 40.1 | 40.2 | 40.4 | 40.3 | 40.3 |
| LWL | 33.3 | 34.0 | 34.0 | 34.5 | 32.4 | 35.0 |
| Beam | 12.8 | 12.8 | 13.3 | 13.1 | 12.9 | 12.1 |
| Displacement | 19 | 15 | 18 | 14 | 19 | 12 |
| Ballast | 7 | 6 | 7 | 5 | 6 | 5 |
| Sail Area | — | 780 | — | 861 | — | 804 |
| Performance | ||||||
| PHRF | — | 33 | — | — | — | 45 |
| SA/Disp | — | 19.2 | — | 22.8 | — | 24.0 |
| Bal/Disp | 37.1 | 42.8 | 38.8 | 40.3 | 36.0 | — |
| Comfort | — | 28.7 | — | 20.3 | — | 19.1 |
| Capsize | — | 1.59 | — | 2.14 | — | 2.09 |
| Hull Speed | — | 9.6 | — | 7.9 | — | 7.9 |