Go to 2:50 in this vid. and watch Mischa lose a rudder to cavitation (not sure that's the right term, maybe ventilation)on a C class, and the end result.

http://vimeo.com/75282563

"I said, now, I said ,pay attention boy!"

The cure for anything is salt water - sweat, tears, or the sea
Isak Dinesen
If a man is to be obsessed by something.... I suppose a boat is as good as anything... perhaps a bit better than most.
E. B. White