The Westerly Tempest 31, a masthead sloop, was designed by Ed Dubois and built in the UK by Westerly Marine Ltd.
Underwater Profile: Fin Keel & Spade Rudder
Hull Material: GRP (Fibreglass)
Length Overall: 30'7" (9.3m)
Waterline Length: 24'6" (7.5m)
Beam: 10'10" (3.3m)
Draft: 5'0" (1.5m)
Rig Type: Masthead sloop
Displacement: 9,019lb (4,019kg)
Ballast: 2,690lb (1,220kg)
Designer: Ed Dubois
Builder: Westerly Marine Ltd (UK)
Year First Built: 1987
Year Last Built: 1993
Number Built: 107
1. Sail Area/Displacement Ratio: 14.8
2. Ballast/Displacement Ratio: 29.8
3. Displacement/Length Ratio: 274
4. Comfort Ratio: 22.2
5. Capsize Screening Formula: 2.1
Read more about these Key Performance Indicators...
1. A Sail Area/Displacement Ratio of just 14.8 suggests that the Westerly Tempest 31 will need a stiff breeze to get her going. In light conditions, unless you've got plenty of time on your hands, motor-sailing may be the way to go.
2. A Ballast/Displacement Ratio of 29.8 means that a sailboat like the Westerly Tempest 31 (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 274, tells us the Westerly Tempest 31 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 22.2 suggests that crew comfort of a Westerly Tempest 31 in a seaway is similar to what you would associate with the motion of a coastal cruiser with moderate stability, which is not the best of news for anyone prone to seasickness.
5. The Capsize Screening Formula of 2.1 tells us that a Westerly Tempest 31 would not be as good a choice of sailboat for ocean passage-making, owing to the increased risk of capsize in strong winds and heavy seas when compared to a sailboat with a CSF of less than 2.0.
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