I've been puzzling over how a centerboard or rudder produces lift.
I thought I understood how an airplane wing produces lift, with its asymmetrical shape, but according to the Wikipedia entry, even that's not correct (maybe).
I'm utterly baffled as to how a symmetrically-shaped foil can produce lift in the desired direction. Or maybe I don't understand the definition of lift correctly.
Anybody know, or know of a helpful link?