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20th August 2004 | 08:32

#4 (permalink)

High Wing Drifter

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From memory!!

LSS = 38.94 * SQRT( 273 - 29)

Mach No = TAS/LSS

OR as you suggested the Whizz Wheel. Line the Mach Index against the temp, put the cursor on the TAS and real the Mach No off the inner scale...I think.