Rman, I too am curious to the effects of the rudder. I've also read that the coupling is in relation to the hor. stab being at a different level as opposed to the wing. The hor. stab. is on the thrust line. Also there is something that you may be able to verify as to the location of the hor. stab. on the .46 model and how does it differ in performance to the .60. Thanks, Joe