What is the primary purpose of using rudder during a turn?

The primary purpose of using the rudder during a turn is to maintain coordination. When an aircraft turns, it naturally experiences a tendency to skid or slip due to the unbalanced forces acting on it. This occurs because the wings create lift, but also produce drag, which affects how the aircraft maneuvers through the air. Using the rudder helps align the aircraft’s nose with the relative wind, allowing for coordinated flight.

In a coordinated turn, the ailerons and rudder work together to ensure that the aircraft follows a smooth path without skidding or slipping. Correct rudder input counters any adverse yaw caused by the ailerons, preventing an unstable flight path and ensuring a more efficient turn. This is crucial for safety and performance, especially during maneuvers that require precision.

While the other options address various aspects of flight dynamics, they do not directly capture the primary role of the rudder in maintaining coordinated flight during turns. Reducing load factors, increasing turn rates, and preventing stalls are related to other controls and circumstances, but the rudder's primary function is focused on achieving and sustaining coordination throughout the turn.