I am familiar with hydrofoilers and what I call "leaping and crashing". The flying hydrofoiler gets a puff, wants to come out of the water at quite a high angle of attack, leaps up then slows while losing lift, and crashes- straight ahead. My catamaran hydrofoilers don't generally want to pitchpole! <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" /> So far, never! They don't capsize either, as the lifting element wants to keep the boat right side up. And they don't break readily. but, you DO have to pay close attention to the mainsheet.

see my webpix: fastsail.com/catcobbler