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Like Faster said, they're awkward to manouver, can't be depowered (imagine yourself caugth in a harsh gale without being able to reef or lower), they're VERY expensive to build since they rely upon complex structures, and are just much less versatile than the plain old standard sail or, a bit more on the performance side, the fully battened sail...
Deeper research would have shown you that wing sails are mostly fit to high performance machines intended to beat straight line speed records (like l'Hydroptére) or otherwise sail under very tight margins of weather conditions and are not at all usefull in ocean crossing or recriational vessels due to their serious limitations in terms of versatility, safety and reliability, the lack of which is always the price of pure speed.
Think of Formula 1 racers. Why aren't those high performance, light and fast engines fit to normal road going family sedans?
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Last edited by pedcab; 11-24-2009 at 03:08 AM.