Which component of a UA controls its yaw movement about the vertical axis?

The rudder is the component of an unmanned aircraft (UA) that controls yaw movement about the vertical axis. Yaw refers to the rotation of the aircraft around its vertical axis, causing the nose of the aircraft to move left or right. The rudder is typically located on the vertical stabilizer of the aircraft and works by creating a differential in airflow on either side of the aircraft's tail. When the pilot (or autopilot) deflects the rudder, it produces thrust in a direction that causes the aircraft to yaw in the desired direction.

This distinguishes it from other components: the elevator is responsible for pitch, controlling movement around the lateral axis; the ailerons control roll, which involves rotation about the longitudinal axis; and flaps are used primarily to increase lift during takeoff and landing, rather than controlling yaw.