The Dufour 365 Grand Large is with acceptable motion comfort for coastal passages.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
7.4 kts
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 30.5′, the Dufour 365 Grand Large tops out around 7.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √30.5′ LWL = 7.4 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
218
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
24.5
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.98
Below the 2.0 offshore threshold — acceptable for ocean passages.
Hull Speed
7.4kts
Pounds/Inch Immersion
1,449lbs
Weight needed to sink the hull one inch — loading sensitivity.
Motion & Offshore Suitability
Two ratios that matter most when you're planning passages — how the boat feels in a seaway, and whether the hull geometry is suitable for open ocean.
Comfort Ratio
24.5
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.98
Below the 2.0 offshore threshold — acceptable for ocean passages.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
PHRF Fleet Position
Where the Dufour 365 Grand Large sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Catalina 36
How It Compares
Side-by-side with the boats most often cross-shopped against the Dufour 365 Grand Large.
| Dufour 365 Grand Large | Beneteau 361 | Catalina 36 | Dufour 36 Performance | Jeanneau Sun Odyssey 34.2 | |
|---|---|---|---|---|---|
| Dimensions | |||||
| LOA | 35.5 | 36.4 | 36.3 | 36.0 | 33.8 |
| LWL | 30.5 | 31.1 | 30.3 | 33.5 | 29.4 |
| Beam | 11.9 | 12.5 | 11.9 | 11.8 | 10.8 |
| Displacement | 13,801 | 13,349 | 13 | 14,110 | 10,253 |
| Ballast | — | 4,156 | 6 | 4,190 | 2,866 |
| Sail Area | — | 718 | 545 | 647 | — |
| Performance | |||||
| PHRF | — | — | 138 | — | — |
| SA/Disp | — | 20.4 | 15.4 | 17.7 | — |
| Bal/Disp | — | 31.1 | 44.4 | 29.7 | 28.0 |
| Comfort | 24.5 | 21.7 | 24.0 | 23.5 | 21.7 |
| Capsize | 1.98 | 2.11 | 2.01 | 1.96 | 1.98 |
| Hull Speed | 7.4 | 7.5 | 7.4 | 7.8 | 7.3 |