The Kettenburg 38 is moderately powered for comfortable coastal cruising, with a steady, comfortable ride offshore.
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 25.8′, the Kettenburg 38 tops out around 6.8 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √25.8′ LWL = 6.8 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
17.2
Moderate sail power — a capable coastal cruiser, not overpowered.
Displacement / Length
311
Moderate-heavy — carries provisions well, deliberate in light air.
Comfort Ratio
39.4
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.40
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
738lbs
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
39.4
Good offshore comfort — steady enough for multi-day passages.
Under 20 — Snappy, racing motion
20–30 — Acceptable coastal
30–40 — Good offshore comfort
Over 40 — Very comfortable offshore
Capsize Screening Formula
1.40
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 Kettenburg 38 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Soverel 38
156s/nm
Ingrid 38
213s/nm
Alerion 38
231s/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 |
4.0 |
| Close Reach60° |
3.3 |
4.2 |
4.7 |
4.9 |
| Beam Reach90° |
4.0 |
5.1 |
5.7 |
6.0 |
| Broad Reach120–135° |
3.7 |
4.7 |
5.3 |
5.5 |
| Run150–180° |
3.0 |
3.8 |
4.2 |
4.4 |
These are simplified estimates based on hull speed (6.8 kts),
SA/D (17.2), 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 Kettenburg 38 — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–20 kts
20–28 kts
28+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–20 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
20–28 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
28+ 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 Kettenburg 38.
|
Kettenburg 38 |
Alerion 38 |
Atlantic 38 Raynor |
Hughes 38 2 |
Ingrid 38 |
Soverel 38 |
| Dimensions |
| LOA |
38.0 |
38.0 |
38.0 |
38.0 |
38.0 |
38.0 |
| LWL |
25.8 |
29.5 |
30.0 |
27.0 |
32.0 |
30.4 |
| Beam |
8.0 |
10.8 |
11.5 |
10.2 |
11.3 |
11.0 |
| Displacement |
12 |
17 |
21 |
12 |
26 |
18 |
| Ballast |
— |
7 |
7 |
— |
8 |
— |
| Sail Area |
561 |
627 |
583 |
584 |
815 |
636 |
| Performance |
| PHRF |
— |
231 |
— |
— |
213 |
156 |
| SA/Disp |
17.2 |
15.2 |
12.3 |
17.2 |
14.9 |
14.9 |
| Bal/Disp |
— |
42.7 |
37.1 |
— |
30.8 |
— |
| Comfort |
39.4 |
34.7 |
38.7 |
29.5 |
46.9 |
34.9 |
| Capsize |
1.40 |
1.68 |
1.67 |
1.75 |
1.53 |
1.68 |
| Hull Speed |
6.8 |
7.3 |
7.3 |
7.0 |
7.6 |
7.4 |