What is the primary function of the rudder in a Cessna 172?

The primary function of the rudder in a Cessna 172 is to control yaw and maintain coordinated flight. The rudder is a vertical control surface located at the tail of the aircraft that moves the nose of the airplane side-to-side. This movement is essential for ensuring that the aircraft flies straight without skidding or slipping during turns.

When an airplane turns, it naturally generates a yawing motion due to the adverse yaw effect, where the aircraft's nose wants to move opposite to the direction of the turn. The rudder counteracts this effect by directing the tail of the airplane in the intended direction of the turn, thus helping to keep the airplane coordinated.

In addition to this primary function, the rudder also plays a role in controlling the aircraft during various flight regimes, including during takeoff and landing, or in the event of an engine failure in multi-engine aircraft. However, in the context of the Cessna 172, its main role remains focused on yaw control and ensuring that the aircraft remains in coordinated flight, preventing undesirable motions that could compromise safety and performance.