The Cape Dory 30 Cutter 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 22.8′, the Cape Dory 30 Cutter tops out around 6.4 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √22.8′ LWL = 6.4 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
15.1
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
40.0%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
375
Heavy displacement — a slow, steady, seakindly hull.
Comfort Ratio
32.8
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.67
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
822lbs
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
32.8
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
1.67
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 Cape Dory 30 Cutter sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Cruiser/Racer 90–150
Cruiser 150–210
Heavy Cruiser 210–300
Cape Dory 36
165s/nm
Cape Dory 28
225s/nm
Cape Dory 25
261s/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° |
2.4 |
3.0 |
3.4 |
3.5 |
| Close Reach60° |
2.9 |
3.7 |
4.1 |
4.3 |
| Beam Reach90° |
3.6 |
4.5 |
5.0 |
5.3 |
| Broad Reach120–135° |
3.3 |
4.2 |
4.7 |
4.9 |
| Run150–180° |
2.6 |
3.3 |
3.7 |
3.9 |
These are simplified estimates based on hull speed (6.4 kts),
SA/D (15.1), 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 Cape Dory 30 Cutter — based on sail area, ballast, and displacement characteristics.
Ghost
Sweet Spot
Reef
Heavy
0–7 kts
7–22 kts
22–32 kts
32+ kts
Ghosting
0–7 kts
Light air, motor-sailing likely. Need patience and a light genoa.
Sweet Spot
7–22 kts
Comfortable under full sail. Best speed-to-comfort ratio.
Time to Reef
22–32 kts
Time to shorten sail. Reef the main, swap to a working jib.
Heavy Weather
32+ 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 Cape Dory 30 Cutter.
|
Cape Dory 30 Cutter |
Cape Dory 25 |
Cape Dory 28 |
Cape Dory 36 |
| Dimensions |
| LOA |
30.2 |
24.8 |
28.1 |
36.1 |
| LWL |
22.8 |
18.0 |
22.2 |
27.0 |
| Beam |
9.0 |
7.3 |
8.9 |
10.7 |
| Displacement |
10,000 |
4 |
9 |
16 |
| Ballast |
4,000 |
1 |
3 |
6 |
| Sail Area |
437 |
264 |
404 |
622 |
| Performance |
| PHRF |
— |
261 |
225 |
165 |
| SA/Disp |
15.1 |
16.8 |
15.0 |
15.7 |
| Bal/Disp |
40.0 |
42.5 |
38.9 |
37.6 |
| Comfort |
32.8 |
22.0 |
31.7 |
35.7 |
| Capsize |
1.67 |
1.83 |
1.71 |
1.69 |
| Hull Speed |
6.4 |
5.7 |
6.3 |
7.0 |