TAS = Mach * a0 * sqrt (T/T0)
EAS = Mach * a0 * sqrt (P/P0)
Which rather appeals to my sense of symmetry.
a0 = 661.48 kts
T0 = 288.15 Kelvin
P0 =1013.25 hPa
Then all you need the ISA stratosphere pressure equation and you can generate CliveL's lookup table.
Last edited by Rivet gun; 24th February 2011 at 15:58.