Review of Oyster 485

Basic specs.

The Oyster 485 is a large sailboat designed by the maritime architect bureau Holman & Pye in the mid nineties. The Oyster 485 is built by the British yard Oyster Marine Ltd..

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Hull

The hull is made of fibreglass. Generally, a hull made of fibreglass requires only a minimum of maintenance during the sailing season.

Keel

Fin keel

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.

Engine

The boat may be equipped with an inboard Perkins M90 diesel engine at 82 hp (61 kW). Calculated max speed is 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.

Stability and Safety

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.

Theoretical Maximum Hull Speed

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.

Immersion rate

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.

L/B (Length Beam Ratio)

What is L/B (Length Beam Ratio)?

The l/b ratio for Oyster 485 is 3.46.

Compared with other similar sailboats it is more spacy than 50% of all other designs. It seems that the designer has chosen an average hull design.

Ballast Ratio

What is a Ballast Ratio?

The ballast ratio for Oyster 485 is 3%.

This ballast ratio shows a righting moment that is higher than 1% of all similar sailboat designs. A righting moment (ability to resist heeling) significantly below average.

D/L (Displacement Length Ratio)

What is Displacement Length Ratio?

The DL-ratio for Oyster 485 is 317 which categorizes this boat among 'medium weight cruisers'.

18% of all similar sailboat designs are categorized as heavier. A heavy displacement combined with smaller water plane area has lower acceleration and is more comfortable.

SA/D (Sail Area Displacement ratio)

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.

The SA/D ratio indicates that it is faster than 2% of all similar sailboat designs in light wind.

Over- / underrigged

Maintenance

Bottom Paint

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.

Rig

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.

**Guiding dimensions of running rig**
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)

Boat owner's ideas

This section is reserved boat owner's modifications, improvements, etc. Here you might find (or contribute with) inspiration for your boat.

Do you have changes/improvements you would like to share? Upload a photo and describe what you have done.

Finally

We are always looking for new photos. If you can contribute with photos for Oyster 485 it would be a great help.

If you have any comments to the review, improvement suggestions, or the like, feel free to contact us. Criticism helps us to improve.

References

[Ref 1]: ISO 8666 Small craft — Principal data.
[Ref 3]: ISO 12215-5 Small craft — Hull construction and scantlings.