Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
6.8 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 25.8′, the S2 91 Se tops out around 6.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √25.8′ LWL = 6.8 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
197
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
6.8kts
Pounds/Inch Immersion
6lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the S2 91 Se sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Seidelmann 30
How It Compares
Side-by-side with the boats most often cross-shopped against the S2 91 Se.
| S2 91 Se | J30 | S2 91 | S2 91 Sd | S2 91 Sm | Seidelmann 30 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 29.8 | 29.8 | 29.8 | 29.8 | 29.8 | 29.8 |
| LWL | 25.8 | 25.0 | 25.0 | 25.0 | 25.0 | 25.0 |
| Beam | 10.5 | 11.2 | 10.5 | 10.5 | 10.5 | 12.0 |
| Displacement | 7 | 7 | 7 | 7 | 7 | 9 |
| Ballast | — | 2 | 3 | — | — | 4 |
| Sail Area | — | 444 | 490 | 490 | 444 | — |
| Performance | ||||||
| PHRF | — | — | — | — | — | 162 |
| SA/Disp | — | 19.5 | 19.9 | 19.9 | 18.0 | — |
| Bal/Disp | — | — | 40.8 | — | — | 47.9 |
| Comfort | — | 16.4 | 20.0 | 20.0 | 20.0 | — |
| Capsize | — | 2.34 | 2.12 | 2.12 | 2.12 | — |
| Hull Speed | — | 6.7 | 6.7 | 6.7 | 6.7 | — |