for the pull pull rudder, do i need a 4" servo arm, or is there even such a thing? can't remember where i was reading about this.
Keep in mind that you may end up putting the rudder servo in the tail. I have the plane with a 3W80, aluminum spinner, wood prop, dual NiMH RX batteries behind the cockpit area, and stock tailwheel assembly. The rudder servo, a Hitec 5955, is in the tail on a push-pull set up.
Dan