Hello Old Smokey,
What did I do wrong to be flamed in red and bold?
I plead guilty to being imprecise, but if we are being nit-picky then consider your response. EAS is the same as TAS at ISA sea level DENSITY and is "equal" to CAS only at speeds where comprssibilty is not a factor.
And I don't see your point about EAS being lower because of reduced compressibility. I was referring to the fact that if you hold a given TAS then the EAS and CAS required to achieve this at high altitude, low density, are less than that required at low level. Maybe I should have used CAS all the time
I never meant the question to wander off into the stratosphere, and in any case when I said thrust would reduce I meant thrust at a given RPM, not drag.
If I read your reply correctly you are saying that there is no general answer to my question, but that it depends on engine design.
Seriously, I have the greatest respect for you, and thank you for the answer
Dick