The Westerly Ocean 49 Sailboat
Specs & Key Performance Indicators
The Westerly Ocean 49, a centre cockpit cutter, was designed by Ed Dubois and built in the UK by Westerly Marine Ltd.
A Westerly 49 cutter
Published Specification for the Westerly Ocean 49
Underwater Configuration: Fin keel and spade rudder
Hull Material: GRP (Fibreglass)
Length Overall: 48'6" (14.8m)
Waterline Length: 42'1" (12.8m)
Beam: 15'1" (4.6m)
Draft: 7'0" (2.1m)
Rig Type: Cutter - a sloop rigged version was also produced
Displacement: 28,935lb (13,125kg)
Designer: Ed Dubois
Builder: Westerly Marine Ltd. (UK)
Year First Built: 1993
Owners Association: Westerly Owners Association
Published Design Ratios for the Westerly Ocean 49
1. Sail Area/Displacement Ratio: Not published
- 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: 40.0
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 173
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 27.4
- 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: 2.0
- 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 Westerly Ocean 49
1. The Sail Area/Displacement Ratio of the Westerly Ocean 49 is not publicly available. If you know differently, please contact us.
2. A Ballast/Displacement Ratio of 40.0 means that the Westerly Ocean 49 will initially stand up reasonably well to her canvas in a moderate breeze, but she'll need a reef in the main to avoid heeling excessively in a gust.
3. A Displacement/Length Ratio of 173, tells us the Westerly Ocean 49 is a light 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 27.4 suggests that crew comfort of a Westerly Ocean 49 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 2.0 indicates that a Westerly Ocean 49 would not be the wisest choice of sailboat for ocean passage-making owing to the lower resistance to capsize in strong winds and heavy seas that is associated with sailboats with a CSF of 2.0 and above.
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