The Oyster 575 Sailboat
Specs & Key Performance Indicators
The Oyster 575, a centre-cockpit cutter, was designed by Rob Humphreys and built in the UK by Oyster Marine Ltd.
An Oyster 575
Published Specification for the Oyster 575
Underwater Profile: Fin keel and spade rudder
Hull Material: GRP (Fibreglass)
Length Overall: 58'8" (17.9m)
Waterline Length: 51'6" (15.7m)
Beam: 16'5" (5.0m)
Draft: 8'10" (2.7m)*
Rig Type: Cutter
Displacement: 58,422lb (26,500kg)
Designer: Rob Humphreys
Builder: Oyster Marine (UK)
Year First Built: 2010
* A shoal draft and a centreboard version are also available.
Published Design Ratios for the Oyster 575
1. Sail Area/Displacement Ratio: 22.4
- Less than 16 would be considered under-powered;
- 16 to 20 would indicate reasonably good performance;
- Over 20 suggests relatively high performance.
2. Ballast/Displacement Ratio: 30.6
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 191
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 40.5
- Under 20 indicates a lightweight racing boat
- 20 to 30 indicates a coastal cruiser
- 30 to 40 indicates a moderate offshore cruising boat
- 40 to 50 indicates a heavy offshore boat
- Over 50 indicates an extremely heavy offshore boat
5. Capsize Screening Formula: 1.7
- Under 2.0 (the lower the better): Better suited for ocean passages
- Over 2.0: Less suited for ocean passages
Read more about these Key Performance Indicators...
Summary Analysis of the Design Ratios for the Oyster 575
1. A Sail Area/Displacement Ratio of 22.4 suggests that, in the right hands, the Oyster 575 will have enough performance to leave most other sailboats of similar waterline length well astern.
2. A Ballast/Displacement Ratio of 30.6 would usually mean that the Oyster 575 would have a tendency to heel uncomfortably in a gust, and need to be reefed early to keep her sailing upright in a moderate breeze.
However, as she has much of her ballast concentrated in a bulb at the foot of her keel, she's likely to be considerably stiffer than her published Ballast/Displacement Ratio might suggest.
3. A Displacement/Length Ratio of 191, tells us the Oyster 575 is a light-to-moderate displacement sailboat. If she's loaded with too much heavy cruising gear her performance will suffer to a degree.
4. Ted Brewer's Comfort Ratio of 40.5 suggests that crew comfort of an Oyster 575 in a seaway is similar to what you would associate with the motion of a heavy bluewater cruising boat. Pitching and rolling will be well damped - your cup of coffee on the salon table stands a reasonable chance of staying there in most conditions.
5. The Capsize Screening Formula (CSF) of 1.7 tells us that an Oyster 575 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.
May 16, 22 04:32 AM
Interested in the Etap 32i sailboat? Here are the pics, specs and performance predictions you're looking for...
May 15, 22 10:55 AM
Interested in the X-332 sailboat? Here are the pics, specs and performance predictions you're looking for...
May 14, 22 06:47 AM
Interested in the Jeanneau Sun Odyssey 44 sailboat? Here are the pics, specs and performance predictions you're looking for...