Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
7.9 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 35.2′, the Offshore 39 Tanton tops out around 7.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √35.2′ LWL = 7.9 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
38.5%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
187
Moderate — a good balance of speed and load-carrying ability.
Hull Speed
7.9kts
Pounds/Inch Immersion
10lbs
Weight needed to sink the hull one inch — loading sensitivity.
PHRF Fleet Position
Where the Offshore 39 Tanton sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Ericson 39 B
Fast Passage 39
Passport 40
Freedom 39
How It Compares
Side-by-side with the boats most often cross-shopped against the Offshore 39 Tanton.
| Offshore 39 Tanton | Ericson 39 B | Fast Passage 39 | Freedom 39 | Passport 40 | Valiant 39 | |
|---|---|---|---|---|---|---|
| Dimensions | ||||||
| LOA | 39.3 | 39.0 | 39.5 | 39.0 | 39.4 | 39.3 |
| LWL | 35.2 | 30.0 | 33.5 | 31.0 | 33.4 | 32.0 |
| Beam | 12.8 | 11.3 | 11.8 | 12.8 | 12.7 | 11.5 |
| Displacement | 18 | 19 | 21 | 18 | 22 | 18 |
| Ballast | 7 | 9 | 7 | 5 | 8 | 7 |
| Sail Area | — | 720 | 799 | 818 | 762 | — |
| Performance | ||||||
| PHRF | — | 114 | 132 | 156 | 141 | — |
| SA/Disp | — | 16.2 | 16.9 | 18.8 | 15.2 | — |
| Bal/Disp | 38.5 | 50.0 | 35.7 | 28.7 | 37.3 | 37.8 |
| Comfort | — | 35.4 | 34.2 | 28.6 | 34.0 | — |
| Capsize | — | 1.70 | 1.72 | 1.94 | 1.79 | — |
| Hull Speed | — | 7.3 | 7.8 | 7.5 | 7.8 | — |