Cruisingfoiler, "Which gets me to the subject of twist. This is an essential element of depowering. Possibly more significantly, twist is essential in dealing with increase in apparent wind angle as height above sea level and true wind speed increase. So the 'simple' single element isn't so simple when scaled up to habitable yacht size."
Yes twist is important and it will always be a compromise with a simple wing and the entire wing will never be able to generate maximum lift. And it is 'apparent' wind speed increases not 'true'.
A wing though is way superior to a sail in dealing with twist not the least of which is because of the triangular shape of the sails.
Yes a wing is going to raise the CoE, which is bad especially for a thin hulled Proa, but at the same time it has less drag than a sail and less total forces acting on it so the heeling moment is going to be comparable. And with a wing it is almost completely controllable, unlike with a gust of wind that knocks a sailboat with a sail down.
Talador
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Posted by: taladorwood@yahoo.com.au
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