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Old 12th Apr 2002, 12:07
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The Greaser
 
Join Date: Mar 2002
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Taking a cruising speed of M0.84 and OAT of -55 celsius gives a true airspeed of 559 statute miles per hour. Hence being in a jetstream with a tailwind component of only 90 mph would give you a groundspeed of 650. Perfectly feasible.
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