Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
7.5 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 31.5′, the Scanner 391 tops out around 7.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √31.5′ LWL = 7.5 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
37.9%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
183
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
7.5kts
Pounds/Inch Immersion
8lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the Scanner 391 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Dehler 39
Mirage 39
How It Compares
Side-by-side with the boats most often cross-shopped against the Scanner 391.
| Scanner 391 | Dehler 39 | Elan 38 | Grand Soleil 38 Finot | Mirage 39 | Scanner 392 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 39.1 | 39.0 | 39.2 | 39.0 | 39.2 | 39.1 |
| LWL | 31.5 | 35.1 | 32.0 | 31.2 | 32.8 | 31.5 |
| Beam | 11.8 | 12.5 | 12.7 | 12.3 | 12.5 | 11.8 |
| Displacement | 12 | 15 | 14 | 14 | 16 | 13 |
| Ballast | 4 | 6 | — | 5 | 6 | 5 |
| Sail Area | — | — | — | 656 | — | — |
| Performance | ||||||
| PHRF | — | 75 | — | — | 111 | — |
| SA/Disp | — | — | — | 17.3 | — | — |
| Bal/Disp | 37.9 | 42.1 | — | 35.3 | 37.5 | 40.2 |
| Comfort | — | — | — | 24.5 | — | — |
| Capsize | — | — | — | 1.99 | — | — |
| Hull Speed | — | — | — | 7.5 | — | — |