The Dehler 37S is modestly canvassed and unhurried, 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 28.2′, the Dehler 37S tops out around 7.1 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √28.2′ LWL = 7.1 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
10.2
Modestly canvassed — a comfortable, unhurried cruiser.
Ballast / Displacement
48.3%
Race-oriented ballast ratio — very stiff and powerful.
Displacement / Length
254
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
25.3
Acceptable coastal comfort — fine for weekends, notice the chop offshore.
Capsize Screening
1.94
Below the 2.0 offshore threshold — acceptable for ocean passages.
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
25.3
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
1.94
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 Dehler 37S sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Express 37
72s/nm
J/37
75s/nm
X 372
95s/nm
Dehler 372
134s/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° |
2.3 |
2.9 |
3.2 |
3.4 |
| Close Reach60° |
2.8 |
3.5 |
3.9 |
4.1 |
| Beam Reach90° |
3.4 |
4.3 |
4.8 |
5.0 |
| Broad Reach120–135° |
3.1 |
4.0 |
4.4 |
4.6 |
| Run150–180° |
2.5 |
3.2 |
3.5 |
3.7 |
These are simplified estimates based on hull speed (7.1 kts),
SA/D (10.2), 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 Dehler 37S — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–8 kts
8–24 kts
24–34 kts
34+ kts
Ghosting
0–8 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
8–24 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
24–34 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
34+ 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 Dehler 37S.
|
Dehler 37S |
Dehler 372 |
Express 37 |
First 375 Beneteau |
J/37 |
X 372 |
| Dimensions |
| LOA |
37.1 |
37.1 |
37.1 |
37.1 |
37.0 |
37.0 |
| LWL |
28.2 |
28.2 |
30.8 |
33.2 |
30.8 |
29.5 |
| Beam |
11.3 |
11.3 |
11.5 |
12.3 |
12.1 |
11.7 |
| Displacement |
12 |
12 |
9 |
15 |
12 |
11 |
| Ballast |
6 |
6 |
4 |
5 |
4 |
4 |
| Sail Area |
348 |
603 |
639 |
648 |
641 |
593 |
| Performance |
| PHRF |
— |
134 |
72 |
— |
75 |
95 |
| SA/Disp |
10.2 |
17.7 |
22.4 |
16.8 |
19.4 |
19.0 |
| Bal/Disp |
48.3 |
48.3 |
46.9 |
34.3 |
40.0 |
43.1 |
| Comfort |
25.3 |
25.2 |
17.9 |
24.5 |
29.0 |
20.6 |
| Capsize |
1.94 |
1.94 |
2.15 |
1.98 |
1.67 |
2.10 |
| Hull Speed |
7.1 |
7.1 |
7.4 |
7.7 |
8.7 |
7.3 |