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Thread: EAS vs TAS vs GS
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Old 18th July 2011 | 14:36
  #4 (permalink)  
keith williams
 
Joined: Jan 2011
Posts: 660
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From: England
TAS is used in power graphs because power required is proportional to TAS cubed.

Because the relationship between EAS, IAS and TAS varies with altitude, it cannot be said that power required is proportional to EAS or IAS in any straight forward way.
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