The Nautor 39 is modestly canvassed and unhurried, with a gentle bluewater motion.
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 31.0′, the Nautor 39 tops out around 7.5 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √31.0′ 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.
SA / Displacement
13.6
Modestly canvassed — a comfortable, unhurried cruiser.
Ballast / Displacement
31.5%
Typical cruising ballast — balanced stability and motion underway.
Displacement / Length
429
Heavy displacement — a slow, steady, seakindly hull.
Comfort Ratio
42.8
Very comfortable in a seaway — a genuine bluewater motion.
Capsize Screening
1.72
Below the 2.0 offshore threshold — acceptable for ocean passages.
SA/Disp (Calculated)
11.3
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
42.8
Very comfortable in a seaway — a genuine bluewater motion.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.72
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 Nautor 39 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Swan 39
84s/nm
Cal 40
120s/nm
Swan 40 Ss
126s/nm
Pearson 39
132s/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° |
2.7 |
3.4 |
3.8 |
3.9 |
| Close Reach60° |
3.2 |
4.1 |
4.6 |
4.8 |
| Beam Reach90° |
4.0 |
5.0 |
5.6 |
5.9 |
| Broad Reach120–135° |
3.7 |
4.6 |
5.2 |
5.4 |
| Run150–180° |
2.9 |
3.7 |
4.2 |
4.3 |
These are simplified estimates based on hull speed (7.5 kts),
SA/D (13.6), 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 Nautor 39 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–8 kts
8–22 kts
22–30 kts
30+ kts
Ghosting
0–8 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
8–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–30 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
30+ 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 Nautor 39.
|
Nautor 39 |
Cal 40 |
Pearson 39 |
Swan 39 |
Swan 40 Ss |
Valiant 39 |
| Dimensions |
| LOA |
39.2 |
39.3 |
39.3 |
39.3 |
39.3 |
39.3 |
| LWL |
31.0 |
30.3 |
30.0 |
31.5 |
28.5 |
32.0 |
| Beam |
13.2 |
11.0 |
11.7 |
12.5 |
10.8 |
11.5 |
| Displacement |
28 |
15 |
17 |
18 |
19 |
18 |
| Ballast |
9 |
6 |
7 |
7 |
7 |
7 |
| Sail Area |
793 |
700 |
— |
761 |
709 |
— |
| Performance |
| PHRF |
— |
120 |
132 |
84 |
126 |
— |
| SA/Disp |
13.6 |
18.5 |
— |
17.8 |
16.0 |
— |
| Bal/Disp |
31.5 |
40.0 |
42.9 |
43.9 |
41.6 |
37.8 |
| Comfort |
42.8 |
28.8 |
— |
28.5 |
38.7 |
— |
| Capsize |
1.72 |
1.79 |
— |
1.91 |
1.63 |
— |
| Hull Speed |
7.5 |
7.4 |
— |
7.5 |
7.2 |
— |