In at least two instances I have had a student pilot up and the ailerons stopped working. I was forced to make all of the turns with the rudder. It is amazing how difficult it is. I had never used the rudder to make turns in the air. Now I practice rudder turns with everything I fly, just in case. I have a few planes, my canard in particular, that will not roll with the rudders. However, I think if I play with the rudders, elevator, and throttle, I may be able to make a turn.