The Grand Soleil 343 Sailboat
Specs & Key Performance Indicators
The Grand Soleil 343, a light-displacement sloop, was designed by Alain Jezequel and built in Italy by Grand Soleil.
A Grand Soleil 343 Sailboat
Published Specification for the Grand Soleil 343
Underwater Profile: Fin keel & spade rudder
Hull Material: GRP (Fibreglass)
Length Overall: 34'2" (10.4m)
Waterline Length: 28'9" (8.8m)
Beam: 11'3" (3.4m)
Draft: 5'11" (1.8m)
Rig Type: Masthead sloop
Displacement: 10,251lb (4,650kg)
Ballast: 3,858lb (1,750kg)
Designer: Alain Jezequel
Builder: Grand Soleil (Italy)
Year First Built: 1985
Published Design Ratios for the Grand Soleil 343
1. Sail Area/Displacement Ratio: 22.8
- 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: 37.6
- Under 40: less stiff, less powerful
- Over 40: stiffer, more powerful
3. Displacement/Length Ratio: 193
- Under 100: Ultralight
- 100 to 200: Light
- 200 to 275: Moderate
- 275 to 350: Heavy
- Over 350: Ultraheavy
4. Comfort Ratio: 20.9
- 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: 2.1
- 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 Grand Soleil 343
1. A Sail Area/Displacement Ratio of 22.8 suggests that, in the right hands, the Grand Soleil 343 will have enough performance to leave most other sailboats of similar waterline length well astern.
2. A Ballast/Displacement Ratio of 37.6 means that a sailboat like the Grand Soleil 343 (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 193, tells us the Grand Soleil 343 is clearly 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 20.9 suggests that crew comfort of a Grand Soleil 343 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 Grand Soleil 343 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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