Originally Posted by
speedracerntrixie
On most R/C models if the aileron differential has been worked out correctly there will be no adverse yaw. Please read that I said MOST models so please don't come back telling me your Cub, SE5, Curtis Jenny and such has to have rudder in the turns, there are exceptions to every rule. If your typical Kaos, Extra, ugly stick type airplanes have adverse yaw it's cure is aileron differential.
I addressed aileron diferential already & as I stated, many ARF instructions have the servo arm @ 90° to the aileron control horn @ neutral W/the control horn coupling rotating concentrically about the hinge line. That does not achieve aileron differential.
Funny how all of the aircraft you cite as needing rudder input are scale while the all but 1 of those you cite as not needing rudder input are not scale & even that one is a short coupled aerobatic airframe.
Indeed, it seems that (at least for the aircraft you cited) scale R/C airframes that don't require rudder input are the exception.
I didn't mean to infer that all R/C aircraft need rudder input for a coordinated turn, but many do. It seems that a lot of post on this thread infer that rudder input is not needed W/O qualifying that many airframes do need rudder input.
As far as turning W/rudder only, where did that idea come from? On 3-channel (sans ailerons) the dihedrel & rudder geometry enhance rudder roll couple. My Sr Telemaster had rudder roll couple even after nearly all of the dihedrel was eliminated.
Most of what I have flown are IMAA legal giants & most of them are scale. I have yet to see any of them that won't turn better in a moderate banked turn W/@ least a small amount of rudder input.
Aileron differential certainly helps & yes they can be turned W/aileron only.