The Oyster 485 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 37.5′, the Oyster 485 tops out around 8.2 knots in displacement mode — after that, the bow wave outruns the hull and resistance climbs steeply.
1.34 × √37.5′ LWL = 8.2 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
13.8
Modestly canvassed — a comfortable, unhurried cruiser.
Comfort Ratio
42.3
Very comfortable in a seaway — a genuine bluewater motion.
Capsize Screening
1.68
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
42.3
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
1.68
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 Oyster 485 sits on the PHRF handicap spectrum — lower numbers mean faster boats.
Racer 0–90
Cruiser/Racer 90–150
Cruiser 150–210
Taswell 49
102s/nm
Caliber 47 Lrc
156s/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° |
3.0 |
3.7 |
4.2 |
4.4 |
| Close Reach60° |
3.6 |
4.5 |
5.1 |
5.3 |
| Beam Reach90° |
4.4 |
5.6 |
6.2 |
6.5 |
| Broad Reach120–135° |
4.1 |
5.1 |
5.7 |
6.0 |
| Run150–180° |
3.3 |
4.1 |
4.6 |
4.8 |
These are simplified estimates based on hull speed (8.2 kts),
SA/D (13.8), 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 Oyster 485 — 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 Oyster 485.
|
Oyster 485 |
Caliber 47 Lrc |
Malo 47 |
Ocean 49 Westerly |
Taswell 49 |
Trinidad 48 Jeanneau |
| Dimensions |
| LOA |
48.5 |
48.6 |
48.1 |
48.5 |
48.8 |
48.6 |
| LWL |
37.5 |
39.5 |
38.2 |
42.1 |
41.9 |
42.0 |
| Beam |
14.0 |
13.2 |
13.5 |
15.1 |
15.0 |
15.1 |
| Displacement |
37 |
33 |
31 |
28 |
32 |
31 |
| Ballast |
13 |
13 |
12 |
11 |
13 |
11 |
| Sail Area |
960 |
1 |
1 |
— |
— |
1,238 |
| Performance |
| PHRF |
— |
156 |
— |
— |
102 |
— |
| SA/Disp |
13.8 |
15.8 |
21.3 |
— |
— |
19.7 |
| Bal/Disp |
— |
39.4 |
— |
— |
40.0 |
34.7 |
| Comfort |
42.3 |
39.0 |
36.4 |
27.4 |
— |
29.8 |
| Capsize |
1.68 |
1.64 |
1.72 |
1.97 |
— |
1.91 |
| Hull Speed |
8.2 |
8.4 |
8.3 |
8.7 |
— |
8.7 |