ORIGINAL: Dumptrucker
I have the mini super cub from E-Hobbies. It has a three channel transmitter. No ailerons. Only rudder and elevator and throttle. I will have to practice with my turns and giving it a little up on the elevator when turning.
With rudder-only control, beware of flying very quickly and using large deflections and angles of bank.
There is a coupling between yaw (the effect caused by the rudder) and roll (normally caused by ailerons).
The coupling is increased by having dihedral in the wings (ie the wings are not in a straight line).
If you have a large angle of bank and keep rudder applied then it will br trying to turn the nose downwards. If you apply up elevator to counter then you have the beginnings of a spiral dive.
Until you are really confident about the behaviour of the plane, apply gentle, but progressive, rudder inputs until you get to about 30 degrees of bank; then ease off the rudder until the bank angle stabilises. A touch of up should be all that's required to keep the plane level.