In forward flight, the cyclic stick (between the pilot's legs) is pushed slightly in the direction of the desired turn, causing the rotor disc to tilt, just as the wings of an airplane are tilted in a banked turn. Helicopters turn in a manner analogous to that of an airplane. Small, simultaneous changes in engine power and rudder deflection are needed in order to maintain proper trim and constant altitude in what is called a "coordinated turn". A slight back-pressure of the stick or yoke raises the nose, causing a "climb" to be initiated, but since the plane is banked toward the center of a circle, the "climb" doesn't cause a change in altitude, instead it causes the plane to fly a circular path. To initiate a turn, the pilot uses the stick or yoke to actuate the ailerons on the wingtips, causing the wing on the inside radius of the turn to go down and the wing on the outside radius of the turn to go up. The rudder is only used to maintain lateral trim, so that the airflow doesn't impinge on the side of the fuselage and drag is minimized. Airplanes do not use their rudder to turn they do it by banking into the direction of the desired turn, then the wings "lift" the plane in that direction.
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