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The definition of a Forward slip has already been posted and I shall reiterate; the terminology Forward Slip refers to the technique of increasing drag to allow an increased descent rate. In the absence of wind, the forward slip is a bit diffucult to coordinate and ensure that drift is zeroed out with rudder being applied in one direction and aileron being used to counter the induced roll.
The definition of a Side Slip has already been posted and I shall reiterate; the terminology Side Slip refers to the technique of crosswind landing whereby the upwind wing is lowered and the rudder is applied to counteract the tendancy to turn the aircraft. If coordinated properly, the aircraft will have no tendency to drift to either side of the runway and will track the centerline.
The definition of a Crab has already bene posted and I shall reiterate; the terminology Crab refers to the technique of zeroing drift in a crosswind by turning into the wind sufficiently with the wings level (same as correcting for drift when cross country flying). This technique of crosswind landing can be considered preferable to passengers who may not like to view the runway at an angle when side slipping. However, as pointed out previously, the crab requires precise timing and if performed improperly can impose large loads to aircraft landing gear not specifically strengthend.
Now a crab can be performed flawlessly with practice. Just prior to touchdown, full rudder is applied to align the longitudinal axis of the plane with the runway before the nosewheel touches down. Because of the precision and skill needed, most instructors do not teach this method and opt for the side slip. Additional training with an instructor is recommended before attempting.
Also, it is difficult to maintain a side slip from entry on final to touchdown and an easier method, combining a crab to within several hundred feet of the runway then side slipping, is more practical
If a 747-400 was landing, what method of crosswind control do you think the Captain will employ?
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