The Oyster 39 Sailboat
Specs & Key Performance Indicators
The Oyster 39, a centre-cockpit ketch, was designed by Donald Pye and built in the UK by Oyster Marine Ltd.
An Oyster 39
Published Specification for the Oyster 39
Underwater Profile: Fin keel with skeg-hung rudder
Hull Material: GRP (Fibreglass)
Length Overall: 40'8" (12.4m)
Waterline Length: 33'4" (10.2m)
Beam: 12'11" (3.9m)
Draft: 5'8" (1.7m)
Rig Type: Ketch
Displacement: 19,498 lb (8,844 kg)
Designer: Donald Pye
Builder: Oyster Marine Ltd (UK)
Year First Built: 1978
Year Last Built: 1984
Number Built: 43
Published Design Ratios for the Oyster 39
1. Sail Area/Displacement Ratio: Not available
- 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: 40.1
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 235
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 28.2
- 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: 1.9
- 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 39
1. The Sail Area/Displacement Ratio of the Oyster 39 is not published; hence we are unable to comment on this aspect of the yacht's performance.
2. A Ballast/Displacement Ratio of 40.1 means that the Oyster 39 should stand up well to her canvas in a blow, helping her to power through the waves.
3. A Displacement/Length Ratio of 235, tells us the Oyster 39 is a moderate displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance. Most of today's sailboats intended for offshore cruising fall into this displacement category.
4. Ted Brewer's Comfort Ratio of 28.2 suggests that crew comfort of a Oyster 39 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not encouraging news for anyone prone to seasickness.
5. The Capsize Screening Formula (CSF) of 1.9 tells us that a Oyster 39 would be a safer choice of sailboat for an ocean passage than one with a CSF of more than 2.0.
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