Join Date: Jul 2006
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Assuming you could find a place to mount this fan-tasy, you'd only ever be able to go as fast as the breeze coming off the fan. So, in the doldrums, you might gain something, but the bow would clearly be dipping. In a breeze, the fan would actually serve to slow down the wind coming at the boat. Want proof? Put a fan in a windward window at home. You'll get good airflow when it's still outside, but if the breeze picks up, you're better off with no fan at all.
In all, newbie though I be, I'll stick to "natural" windpower.