The Cooper 508 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 44.0′, the Cooper 508 tops out around 8.9 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √44.0′ LWL = 8.9 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
17.5
Moderate sail power — a capable coastal cruiser, not overpowered.
Ballast / Displacement
43.0%
Stiff enough to carry a big genoa comfortably into moderate breeze.
Displacement / Length
201
Moderate — a good balance of speed and load-carrying ability.
Comfort Ratio
35.0
Good offshore comfort — steady enough for multi-day passages.
Capsize Screening
1.78
Below the 2.0 offshore threshold — acceptable for ocean passages.
Pounds/Inch Immersion
2lbs
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
35.0
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
1.78
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 Cooper 508 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Little Harbor 50
69s/nm
Valiant 50
102s/nm
Shannon 50
117s/nm
Tatoosh 51
120s/nm
Formosa 51
198s/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° |
3.6 |
4.5 |
5.1 |
5.3 |
| Close Reach60° |
4.3 |
5.5 |
6.1 |
6.4 |
| Beam Reach90° |
5.3 |
6.7 |
7.5 |
7.8 |
| Broad Reach120–135° |
4.9 |
6.2 |
7.0 |
7.2 |
| Run150–180° |
3.9 |
5.0 |
5.6 |
5.8 |
These are simplified estimates based on hull speed (8.9 kts),
SA/D (17.5), 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 Cooper 508 — 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 Cooper 508.
|
Cooper 508 |
Formosa 51 |
Little Harbor 50 |
Shannon 50 |
Tatoosh 51 |
Valiant 50 |
| Dimensions |
| LOA |
50.7 |
50.8 |
50.8 |
50.9 |
50.6 |
50.7 |
| LWL |
44.0 |
39.6 |
42.2 |
42.8 |
42.1 |
40.3 |
| Beam |
15.0 |
14.1 |
15.1 |
14.3 |
15.4 |
13.8 |
| Displacement |
38 |
52 |
43 |
39 |
44 |
35 |
| Ballast |
16 |
12 |
18 |
15 |
14 |
11 |
| Sail Area |
1 |
1,254 |
1 |
1 |
1 |
— |
| Performance |
| PHRF |
— |
198 |
69 |
117 |
120 |
102 |
| SA/Disp |
17.5 |
14.5 |
16.3 |
17.1 |
15.7 |
— |
| Bal/Disp |
43.0 |
23.1 |
— |
39.7 |
— |
31.0 |
| Comfort |
35.0 |
55.3 |
40.2 |
38.8 |
39.9 |
— |
| Capsize |
1.78 |
1.51 |
1.72 |
1.68 |
1.75 |
— |
| Hull Speed |
8.9 |
8.4 |
8.7 |
8.8 |
8.7 |
— |