What does the rudder control in an aircraft?

The rudder is a key control surface located on the vertical stabilizer of an aircraft, and its primary function is to manage yaw. Yaw refers to the side-to-side movement of the aircraft's nose around its vertical axis. When a pilot uses the rudder, it creates a change in the airflow around the tail, causing the aircraft to rotate left or right depending on the direction of pedal input.

Understanding the role of the rudder is essential for effective aircraft control, especially during coordinated turns and while flying in crosswinds. Using the rudder appropriately helps maintain directional stability and control during various phases of flight, including takeoff, landing, and maneuvers.

The other choices do not pertain to the function of the rudder: pitch is controlled by the elevator, affecting the angle of the nose up or down; roll is managed by the ailerons, which control the aircraft's tilt about its longitudinal axis; weight distribution is influenced by loading and fuel placement, not a control surface.