The Sun Odyssey 389 Jeanneau is well-powered with enough sail area to move in light air, with acceptable motion comfort for coastal passages.
Hull Speed
The theoretical displacement-mode speed limit — determined by waterline length, not engine or sail power.
A displacement hull pushes a bow wave whose speed is limited by the waterline length.
With a waterline of 34.1′, the Sun Odyssey 389 Jeanneau tops out around 7.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √34.1′ LWL = 7.8 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
20.0
Powerful cruiser/racer — quick in light air, reef early when it pipes up.
Ballast / Displacement
26.5%
Light ballast — tends to be tender; reef earlier than the numbers suggest.
Displacement / Length
166
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
22.5
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.01
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
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
22.5
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
2.01
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
Under 2.0 — Acceptable for offshore
Over 2.0 — Coastal / protected waters
Estimated Speed by Wind
Rough boat speed estimates at different true wind speeds and points of sail — derived from hull speed, SA/D, and displacement, not measured polars.
| Point of Sail |
6 kts TWS |
10 kts TWS |
15 kts TWS |
20 kts TWS |
| Close-hauled40–50° |
3.4 |
4.3 |
4.8 |
5.0 |
| Close Reach60° |
4.1 |
5.2 |
5.8 |
6.0 |
| Beam Reach90° |
5.0 |
6.3 |
7.1 |
7.7 |
| Broad Reach120–135° |
4.6 |
5.9 |
6.6 |
7.1 |
| Run150–180° |
3.7 |
4.7 |
5.2 |
5.5 |
These are simplified estimates based on hull speed (7.8 kts),
SA/D (20.0), and empirical efficiency curves — not instrument-measured
polars. Real-world speed varies with sea state, bottom condition, sail trim, and current.
Speeds in gold approach hull speed;
bold gold means near or at hull speed.
Wind Range & Comfort Envelope
Estimated wind ranges for comfortable sailing on the Sun Odyssey 389 Jeanneau — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–6 kts
6–16 kts
16–24 kts
24+ kts
Ghosting
0–6 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
6–16 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
16–24 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
24+ kts
Storm conditions. Storm jib or bare poles. Seek shelter if coastal.
How It Compares
Side-by-side with the boats most often cross-shopped against the Sun Odyssey 389 Jeanneau.
|
Sun Odyssey 389 Jeanneau |
Sun Odyssey 36.2 Jeanneau |
Sun Odyssey 379 Jeanneau |
Sun Odyssey 380 Jeanneau |
Sun Odyssey 409 Jeanneau |
| Dimensions |
| LOA |
38.6 |
36.0 |
— |
36.8 |
— |
| LWL |
34.1 |
— |
— |
35.1 |
— |
| Beam |
12.3 |
— |
— |
12.3 |
— |
| Displacement |
14 |
— |
— |
15 |
— |
| Ballast |
3 |
— |
— |
4 |
— |
| Sail Area |
754 |
— |
— |
682 |
— |
| Performance |
| SA/Disp |
20.0 |
— |
— |
17.9 |
— |
| Bal/Disp |
26.5 |
— |
— |
29.1 |
— |
| Comfort |
22.5 |
— |
— |
23.2 |
— |
| Capsize |
2.01 |
— |
— |
2.00 |
— |
| Hull Speed |
7.8 |
— |
— |
7.9 |
— |