The Formosa 42 Sailboat
(aka the Slocum 43)
Specs & Key Performance Indicators
The Formosa 42, an aft cockpit cutter, was designed by Stan Huntingford and built in Taiwan by Formosa Boat Building Co. Ltd.
A Formosa 42, also known as the Slocum 43
Published Specification for the Formosa 42
Underwater Profile: Fin keel & skeg-hung rudder
Hull Material: GRP (Fibreglass)
Length Overall: 42'6" (12.9m)
Waterline Length: 35'10" (10.9m)
Beam: 12'11" (3.9m)
Draft: 6'4" (1.9m)
Rig Type: Cutter
Displacement: 28,104lb (12,748kg)
Designer: Stan Huntingford
Builder: Formosa Boat Building Company Ltd. (Taiwan)
Year First Built: 1981
Year Last Built: 1990
Number Built: 60
Published Design Ratios for the Formosa 42
1. Sail Area/Displacement Ratio: 14.1
- 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: 32.0
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 273
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 38.0
- 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 Formosa 42
1. A Sail Area/Displacement Ratio of just 14.1 suggests that the Formosa 42 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 32.0 means that a sailboat like the Formosa 42 (which doesn't have a stiffness-enhancing bulb keel), is likely to bene
fit from being reefed early to keep her sailing upright in a moderate breeze.
3. A Displacement/Length Ratio of 273, tells us the Formosa 42 is a moderate-to-heavy displacement cruiser, which means she'll carry all your cruising gear without it having a dramatic effect on her performance.
4. Ted Brewer's Comfort Ratio of 38.0 suggests that crew comfort of a Formosa 42 in a seaway is similar to what you would associate with the motion of a moderate bluewater cruising boat - a predictable and acceptable motion for most seasoned sailors.
5. The Capsize Screening Formula (CSF) of 1.7 indicates that a Formosa 42 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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