Originally Posted by fluid flow
Assuming Gamma is constant takes away the density problem. But is this assumption valid in a Cb
Originally Posted by hazelnuts39
Secondly, the graph you're referring to shows 0,4% change of gamma for saturated air. Let's consider FL350, M=0,8 and gamma changes rapidly from 1.4 to 1.33 (5%). A simple calculation shows that pitot pressure would increase by 0,3% and the indicated Mach would increase from 0,8 to 0,8032.
From your response, I gather that a transient change in gamma (due to updrafts/convective delivery of significantly different air mass) would not be of sufficient magnitude to influence performance at the margins.
Do I read you clearly?