I remember reading somewhere a long time ago (might have been a book) that, for convenience in giving the speed of aircraft as a Mach number, the speed of sound is taken as constant above a certain altitude. I also remember that that speed in mph was given with a resolution of 4 or 5 digits and looked quite authoritative. But I've never been able to find that kind of statement again. Does anyone here know?
The speed of sound is
a = square root ( k.R.T ) k = 1.34 R = 287.05287
since the temperature gradient is 0 between 11 and 20 kms and 47 and 51 kms the speed of sound is constant at these levels.
Refer to :
correction k = 1.4
Thanks. I didn't mention that the figure 671.** mph stuck in my mind but I couldn't be sure. It didn't occur to me to convert it to m/s. Doing so yields almost exactly 300 m/s and that would have been a clue.
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