McInnis is right. You are controlling the angle of attack with trim on an outdrive or outboard. One other factor to consider, though, is that as you adjust that angle, you are also pointing the propeller in that direction as well. With the propeller trimmed up, you have no bite in the water, with more resistance from the foil...good luck getting on plane. Also, the foil is typically attached to the cavitation plate - the horizontal fin that the boat is actually riding on. So, no matter if you attache the foil right side up or up side down, it will always be at the angle that is the cavitation plate. (Message edited by froese on September 12, 2006)
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