The Sun Liberty 34 Jeanneau is aggressively canvassed for its weight, 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 26.4′, the Sun Liberty 34 Jeanneau tops out around 6.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √26.4′ LWL = 6.9 kts
Performance Ratios
Racing handicap, sail-carrying power, stability and comfort — and what each one actually tells you about a day on the water.
SA / Displacement
22.2
Performance-oriented — carries a lot of canvas for its weight.
Ballast / Displacement
32.3%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
252
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
21.9
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
2.11
Above the 2.0 offshore threshold — best suited for coastal and protected waters.
SA/Disp (Calculated)
15.9
Computed from measured I/J/P/E rather than reported sail area.
Pounds/Inch Immersion
1lbs
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
21.9
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
2.11
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
PHRF Fleet Position
Where the Sun Liberty 34 Jeanneau sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
X 99
111s/nm
Cs 33
150s/nm
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° |
3.1 |
4.0 |
4.4 |
4.6 |
| Close Reach60° |
3.8 |
4.8 |
5.4 |
5.6 |
| Beam Reach90° |
4.7 |
5.9 |
6.6 |
6.9 |
| Broad Reach120–135° |
4.3 |
5.4 |
6.1 |
6.3 |
| Run150–180° |
3.4 |
4.4 |
4.9 |
5.1 |
These are simplified estimates based on hull speed (6.9 kts),
SA/D (22.2), 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 Liberty 34 Jeanneau — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–5 kts
5–16 kts
16–24 kts
24+ kts
Ghosting
0–5 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
5–16 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 Liberty 34 Jeanneau.
|
Sun Liberty 34 Jeanneau |
Cs 33 |
Dufour Classic 32 |
Feeling 960 |
X 34 Ton |
X 99 |
| Dimensions |
| LOA |
32.7 |
32.7 |
32.7 |
32.8 |
32.8 |
32.7 |
| LWL |
26.4 |
26.4 |
27.2 |
25.7 |
25.6 |
27.7 |
| Beam |
11.5 |
10.7 |
10.8 |
10.6 |
11.1 |
9.7 |
| Displacement |
10 |
10 |
9 |
8 |
7 |
6 |
| Ballast |
3 |
4 |
2 |
3 |
— |
2 |
| Sail Area |
656 |
503 |
— |
— |
543 |
— |
| Performance |
| PHRF |
— |
150 |
— |
— |
— |
111 |
| SA/Disp |
22.2 |
17.4 |
— |
— |
22.8 |
— |
| Bal/Disp |
32.3 |
42.5 |
27.5 |
34.9 |
— |
45.7 |
| Comfort |
21.9 |
23.3 |
— |
— |
16.9 |
— |
| Capsize |
2.11 |
1.98 |
— |
— |
2.27 |
— |
| Hull Speed |
6.9 |
6.9 |
— |
— |
6.8 |
— |