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physics question about pull ups



 
 
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Old April 21st 10, 02:28 AM posted to rec.aviation.soaring
Bruce Hoult
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Default physics question about pull ups

On Apr 21, 8:41*am, Chris Reed wrote:
A pilot flying at the UK Juniors a few years ago described a racing
finish in a K8, producing no more than a 200 ft climb from a 90kt
pull-up. He said that a K8 in this mode was the ultimate efficient
machine "for converting height into noise".


Disregarding drag, the formula to convert speed in knots to the height
in feet with equivalent energy is speed squared, divided by 22.57. It
will take this much height, plus a bit more, to accelerate to that
speed, and on slowing down you will get that much height, less a bit.

For 90 knots this is 359 ft.
At, say, 50 knots, it is 111 feet.

So you'd expect only 248 ft gain even with no drag at all.
 




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