Originally Posted by Phillbo
Hydrofoil? I'm trying to figure out what you are talking about. I've heard of people putting Whale Tails on the outdrive but I don't think they accomplish much since any forward speed has it out of the water pretty quick....
Whale Tail is just a brand name of a hydrafoil. A large number of people report that they are able to get on plane much quicker and stay on plane at relatively slower speeds.
The problem I have with them is a boat is supposed to get lift from the hull. A foil is generating lift from the outdrive, which is transferring vertical force to the transom assembly. The drive and transom assembly were not designed to lift the weight of the boat and assist in the planing forces. Trim tabs do the same thing.