But try to see it in the context of the first reply. It really does take some time and experience to feel the difference between smaller and larger designs. Once you've had your hands on the sticks of both, the differences are apparent. Ailerons are on the roll axis. In a purist sense they would do nothing more than move the wings up or down as viewed from inside the cabin. The rudder commands the yaw axis which would move the nose left or right as viewed from inside the cabin. So in theory, neither one alone is giving the desired result which is a coordinated turn. When you say the rudder is actually an elevator while the plane is on it's side is correct in a way, but not this way. We are talking about a large plane doing a scale like shallow coordinated turn, with say 10~15° of bank. If you a relatively new to the hobby, again refferring to one of the replies, start using your left hand on the 4th axis a little at a time. Do you have a particular need for that function on your radio at this time Take care_Bob