What occurs due to insufficient rudder in the direction of the turn?

When insufficient rudder is applied in the direction of a turn, the aircraft will experience a skid. This occurs because the aircraft is not able to maintain the coordinated flight path that is required during a turn. In this situation, the aircraft's nose tends to move outside of the desired turn radius, resulting in the tail moving inward. This misalignment causes a yawing motion that is not aligned with the turn direction, ultimately leading to a sensation of the aircraft slipping sideways or skidding across the turn.

In cooperative aerodynamics, rudder input is essential for counteracting the adverse yaw that occurs when ailerons are applied during a turn. Without enough rudder input, the aircraft cannot effectively balance the lateral forces, leading to an imbalance that can compromise control and stability during the maneuver. This is why recognizing and applying the correct amount of rudder during turns is crucial for maintaining coordinated flight.