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 26.0′, the Riptide 31 tops out around 6.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √26.0′ 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.
Ballast / Displacement
30.7%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
315
Moderate-heavy — carries provisions well, deliberate in light air.
Hull Speed
6.8kts
Pounds/Inch Immersion
5lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the Riptide 31 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Monsun 31
How It Compares
Side-by-side with the boats most often cross-shopped against the Riptide 31.
| Riptide 31 | Commander 31 Bianca | Grampian Classic 31 | Hallberg Rassy 312 | Monsun 31 | Orion 27 2 Pacific Seacraft | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 30.8 | 30.7 | 30.9 | 30.9 | 30.8 | 30.9 |
| LWL | 26.0 | 22.0 | 22.3 | 25.3 | 24.7 | 22.2 |
| Beam | 9.5 | 8.8 | 8.4 | 10.1 | 9.4 | 9.3 |
| Displacement | 12 | 7 | 9 | 10 | 9 | 10 |
| Ballast | 3 | 3 | — | 4 | 4 | 3 |
| Sail Area | — | 334 | 440 | 484 | 414 | 508 |
| Performance | ||||||
| PHRF | — | — | — | — | 204 | — |
| SA/Disp | — | 13.7 | 15.5 | 15.9 | 15.1 | 17.6 |
| Bal/Disp | 30.7 | 45.7 | — | — | 45.4 | — |
| Comfort | — | 26.6 | 35.5 | 28.5 | 27.2 | 32.2 |
| Capsize | — | 1.79 | 1.58 | 1.83 | 1.80 | 1.72 |
| Hull Speed | — | 6.3 | 6.3 | 6.7 | 6.7 | 6.3 |