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Old 19th May 2010 | 09:42
  #4 (permalink)  
syedo
 
Joined: Jul 2009
Posts: 29
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From: abu dhabi
lets see...

at 28000 ft, the temperature at ISA+10 will be -31 degree celcius.
from the calculator that i found here :
Speed of sound in air and the temperature calculator air pressure - table density of air calculation acoustic impedance air density sea level velocity ideal gas 20 degrees or 21 degrees Celsius C - sengpielaudio Sengpiel Berlin

the speed of sound will be = 605.945 knots....
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