Slip refers to a specific aerodynamic condition during flight. In this state, an airplane moves inward during a turn or drifts sideways while moving forward in relation to the oncoming airflow. This phenomenon can occur both intentionally and unintentionally, depending on the situation.
An unintentional slip often happens during a turn that is not coordinated properly. In this case, the pilot may not have provided enough rudder input to balance the aircraft. On the other hand, an intentional slip involves a deliberate maneuver. This can be a forward slip or a sideslip, where the pilot uses ailerons to steer in one direction while simultaneously applying rudder in the opposite direction.
Pilots perform intentional slips to achieve specific goals. For example, they might want to increase their descent rate without adding to their airspeed. Additionally, this technique helps maintain alignment with the runway during crosswind landings. Understanding slip is crucial for pilots to ensure safe and effective flying.






