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The mkiv Supra Owners Club

Hong Kong Kai Tak Airport


Nic

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Indeed fond memories....with approximately 20 landings at the old Kai Tak under my belt. Twas certainly spectacular.

 

Used to be a rooftop restaurant there called the Yellow Banana which was always fun to take guests ;)

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I thought the sidways landing was called crabbing and was done because of high winds. At least this is what a pilot told me.

 

Ooh, research suggests it's actually both!!

 

There is sideslipping, forward slipping and crabbing.

 

The definition of a Forward slip; 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; 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; 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.

 

So crabbing is to reduce the effects of crosswind, you have to pull out of the crab just before landing to prevent damage to the undercarriage.

Slipping is also turning sideways, but in low wind conditions, and this IS to lose altitude quickly.

Side Slipping is facing straight down the runway and tipping one wing down to effectively turn into the sidewind, so again negating it's effect.

 

I think slipping is more for small aircraft and crabbing is for larger passenger jets - passengers don't tend to like seeing the runway approaching whilst half rolled over!!

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