Review of Oyster 485
Basic specs.
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The Oyster 485 is equipped with a fin keel. The fin keel is the most common keel and provides splendid manoeuvrability. The downside is that it has less directional stability than a long keel.
The boat can only enter major marinas as the draft is about 2.13 - 2.23 meter (6.99 - 7.29 ft) dependent on the load. See immersion rate below.
The boat is typically equipped with an inboard Perkins M90 diesel engine at 82.0 hp (61 kW), which gives a max speed about 6.7 knots.
Sailing characteristics
This section covers widely used rules of thumb to describe the sailing characteristics. Please note that even though the calculations are correct, the interpretation of the results might not be valid for extreme boats.
What is Capsize Screening Formula (CSF)?
The capsize screening value for Oyster 485 is 1.67, indicating that this boat could - if evaluated by this formula alone - be accepted to participate in ocean races.
What is Theoretical Maximum Hull Speed?
The theoretical maximal speed of a displacement boat of this length is 8.2 knots. The term "Theoretical Maximum Hull Speed" is widely used even though a boat can sail faster. The term shall be interpreted as above the theoretical speed a great additional power is necessary for a small gain in speed.
The immersion rate is defined as the weight required to sink the boat a certain level.
The immersion rate for Oyster 485 is about 327 kg/cm, alternatively 1831 lbs/inch.
Meaning: if you load 327 kg cargo on the boat then it will sink 1 cm.
Alternatively, if you load 1831 lbs cargo on the boat it will sink 1 inch.
Sailing statistics
This section is statistical comparison with similar boats of the same category. The basis of the following statistical computations is our unique database with more than 26,000 different boat types and 350,000 data points.
What is L/B (Length Beam Ratio)?
The l/b ratio for Oyster 485 is 3.46.
The ballast ratio for Oyster 485 is 3%.
What is Displacement Length Ratio?
The DL-ratio for Oyster 485 is 317 which categorizes this boat among 'medium weight cruisers'.
What is SA/D (Sail Area Displacement ratio)?
The SA/D for Oyster 485 with ISO 8666 reference sail is 13.7, with a 135% genua the SA/D is 16.3.
Maintenance
When buying anti-fouling bottom paint, it's nice to know how much to buy.
The surface of the wet bottom is about 55m2 (592 ft2).
Based on this, your favourite maritime shop can tell you the quantity you need.
Note: If you use a paint roller you will need more paint than if you use a paintbrush.
Dimensions of sail.
Are your sails worn out? You might find your next sail here: Sails for Sale
If you need to renew parts of your running rig and is not quite sure of the dimensions, you may find the estimates computed below useful.
| Usage | Length | Diameter | ||
| Mainsail halyard | 40.3 m | (132.4 feet) | 14 mm | (0.55 inch) |
| Jib/genoa halyard | 40.3 m | (132.4 feet) | 14 mm | (0.55 inch) |
| Spinnaker halyard | 40.3 m | (132.4 feet) | 14 mm | (0.55 inch) |
| Jib sheet | 14.8 m | (48.5 feet) | 16 mm | (5/8 inch) |
| Genoa sheet | 14.8 m | (48.5 feet) | 16 mm | (5/8 inch) |
| Mainsheet | 36.9 m | (121.2 feet) | 16 mm | (5/8 inch) |
| Spinnaker sheet | 32.5 m | (106.7 feet) | 16 mm | (5/8 inch) |
| Cunningham | 5.2 m | (17.0 feet) | 14 mm | (0.55 inch) |
| Kickingstrap | 10.4 m | (34.0 feet) | 14 mm | (0.55 inch) |
| Clew-outhaul | 10.4 m | (34.0 feet) | 14 mm | (0.55 inch) |
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