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Old 20th November 2013 | 07:53
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Captfahad
 
Joined: Nov 2013
Posts: 11
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From: Karachi
I read this one one forum it says...

At FL200 ,Assume Aerofoil 'A' 's airflow reaches M1.0 on the upper surface at forward speed of M 0.85, This defines Mcrit of A as Mcrit=M0.85, which means the upper surface of the wing has accelerated the air by M0.15
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