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Old 30th November 2009 | 14:38
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papa600
 
Joined: Jul 2008
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From: under papa 600
Mach Number
Can someone please exlain why Mach Number is used to measure air speed at high altitude as opposed to IAS.

Also - is this measured directly by the pitot in the same way as IAS and how is it calibrated to read Mach number?
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