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| Differences between Aircraft Skid and Slip |
The term skid denotes a particular type of slip that occurs when the airplane is in a bank and the uncoordinated airflow is coming from the side with the raised wing. Typically this happens because you have tried to speed up a turn using “bottom rudder”, that is, pressing the rudder pedal on the same side as the lowered wing.
Having a plenty of airspeed, the aerodynamics of a skid is the same as the aerodynamics of a proper slip. In both cases there is air flowing crosswise over the fuselage.
A slip is an aerodynamic state where an aircraft is moving somewhat sideways as well as forward relative to the oncoming airflow or relative wind. In other words, for a conventional aircraft, the nose will be pointing in the opposite direction to the bank of the wing(s). The aircraft is not in coordinated flight and therefore is flying inefficiently.
There are two types of slips, each defined by its purpose and outcome, even though both require similar control inputs. A forward slip is used to steepen the landing approach, when wing flaps have already been lowered and aren’t producing sufficient effect or when flaps aren’t available for some reason. A side slip, on the other hand, is required when a crosswind threatens to push the aircraft off the runway or, at the very least, the landing gear is going to suffer side load from the wind’s drift effect.
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