Sideslip
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Sideslip is an aircraft maneuver that uses opposite aileron and rudder. This maneuver is often used when landing in a crosswind. Additionally, it is aerodynamically less efficient than balanced flight and so can be used to lose height without gaining excessive airspeed.
Applying aileron causes the aircraft to roll. This causes a horizontal component of lift, which "pulls" the aircraft horizontally to one side. Under normal circumstances, this would turn the aircraft onto a new heading. However, the application of opposite rudder prevents the turn and keeps the aircraft pointing on its original heading with the horizontal component of lift causing the aircraft to "slip" sideways in the direction of bank.
For example, when approaching a runway that has a crosswind from the left, the pilot may apply left aileron to bank the aircraft slightly and also apply right rudder to keep the aircraft pointing toward the runway. By controlling the angle of bank, the pilot can sideslip the aircraft to exactly counter the crosswind.