I have the square rudders on a P-19 Classic (pinhead) and the only time I see any problem with them is when I'm tacking, I can look down into the water and see the tips cavitating. There are obvious trails of bubbles in the water coming off the tips. So far it hasn't been a problem (I'm a big guy, and I can drive the sterns REAL deep in the water when I need to) but if I start having trouble, especially with the big chute, I'll certainly upgrade the rudders. Jack at Performance quoted me about 400 for a set of the new-style blades, but for now, I'll stay square...

sail fast