There are tons of ways to do this. The easiest system is to make sure that the center of pivot at the control horns are on the rudder hinge line. That will allow you to have a servo arm with zero offset. The second thing is that if you use a 4" servo arm then make sure your rudder control horn has the same span. In the pics I use the SWB 4" servo arm and at the rudder is a horn system that I developed and may make a production item.


Shawn Berkheimer

R/C Blimp Productions.com