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Old 10th Apr 2006, 11:30
  #35 (permalink)  
Zhaadum
 
Join Date: Mar 2004
Location: Perth
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Elevator & Braking

Getting back on track to GA aircraft types, not Airbus / Boeings.

I think people are missing the point of progressive up (backstick) elevator application during braking. It is NOT used for aerodynamic braking at all.

The reason is to add a tail down moment around the C.G . Aircraft fitted with tricycle undercarriage have the main wheels aft of the C.G., so this has the effect of adding effective weight to the main wheels.

The result is the braking effort can be increased and the tyres will resist lockup better. It also keep undue weight off the nose wheel as some aircraft (C210) have a relatively weak nose leg anyway, so you don't want it bashing through the rocks with lots of weight on it.

It is true dumping the flaps reduces lift and puts weight on the tyres/brakes. It also removes lots of drag early in the landing which is detrimental to effective aerodynamic braking. Which is the greater effect? At what speed? Who knows, it probably depends on aircraft type/design.

The DANGER in flap dumping is reaching for the gear instead of the flap lever. I would not recommend the flap dump technique for this reason alone. (ask any Bonanza/Baron pilot).

Z.
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