The Westerly Typhoon 37 Sailboat
Specs & Key Performance Indicators
The Westerly Typhoon 37, an aft-cockpit fractional sloop, was designed by Ed Dubois and built in the UK by Westerly Marine Construction Co Ltd.
A Westerly Typhoon 37
Published Specification for the Westerly Typhoon 37
Underwater Profile: Fin keel & spade rudder
Hull Material: GRP (Fibreglass)
Length Overall: 37'4" (11.4m)
Waterline Length: 31'11" (9.7m)
Beam: 12'4" (3.8m)
Draft: 6'0" (1.8m)
Rig Type: Fractional sloop
Displacement: 16,470lb (7,471kg)
Designer: Ed Dubois
Builder: Westerly Marine Construction Co Ltd (UK)
Year First Built: 1990
Year Last Built: 1993
Number Built: 40
Published Design Ratios for the Westerly Typhoon 37
1. Sail Area/Displacement Ratio: 21.3
- 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: 36.7
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 226
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 26.7
- 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 Westerly Typhoon 37
1. A Sail Area/Displacement Ratio of 21.3 suggests that, in the right hands, the Westerly Typhoon 37 will have enough performance to leave most other sailboats of similar waterline length well astern.
2. A Ballast/Displacement Ratio of 36.7 means that a sailboat like the Westerly Typhoon 37 (which doesn't have a stiffness-enhancing bulb keel), is likely to benefit from being reefed early to keep her sailing upright in a moderate breeze.
3. A Displacement/Length Ratio of 226 tells us the Westerly Typhoon 37 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 26.7 suggests that crew comfort of a Westerly Typhoon 37 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 indicates that a Westerly Typhoon 37 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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