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18th Jul 2011, 14:36

#4 (permalink)

keith williams

Join Date: Jan 2011

Location: England

Posts: 661

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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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