Tony,

I run my rudders at 90 degrees to the deck by using a teflon block on the upper pivot gudgeons. The rudders are set up so that the bottom leading tip is exactly in line with the axis of rotation.

I used to have them set up with varying amounts of forward bias to account for poor sail shape but found that they were unpredictable at high speeds and resulted in many out of control reaches. <img src="http://www.catsailor.com/forums/images/graemlins/blush.gif" alt="" /> If the blade is behind the axis it must behave predictably.

Regards,

Peter