What is the primary function of the rudder in an aircraft?

The primary function of the rudder in an aircraft is to control yaw and maintain directional stability. The rudder is a vertical control surface located on the tail of the airplane, and it influences the aircraft's movement around its vertical axis. When the pilot deflects the rudder to the left or right, it creates a force that causes the aircraft to rotate in the corresponding direction, allowing for adjustments in heading or direction during flight.

Additionally, the rudder helps to stabilize the aircraft's yaw motion, particularly during maneuvers that might otherwise induce unwanted lateral movement caused by winds or engine asymmetry, thereby enhancing overall directional stability. Proper use of the rudder is essential for coordinated turns, as it helps align the aircraft's fuselage with its flight path.

The other options address different aspects of flight control. For example, increasing lift is primarily the function of the wings, while controlling pitch is managed by the elevator. Reducing drag is an aerodynamic consideration but not a function of the rudder.