Minnflyer is correct. The rudder is used in a normal turn only to counter any adverse yaw. Actually, you'll find most of the turn is done with the elevator. As the plane banks you must feed in up elevator to hold your altitude, while the ailerons are neutralized once the desired bank is achieved. A trainer will slowly try to level it's wings, while a pattern type ship will pretty well stay where you put it. The sharper the bank, the more elevator needed. The adverse yaw can often be overcome by having a lot more up aileron than down. The up aileron is in a lower pressure area on top of the wing, while the down aileron is in the high pressure area on the wings bottom, so it creates a lot more drag.