"Peter Duniho" wrote

The problem is that this analysis assumes constant thrust. I've seen
nothing to indicate that, as a rule, jet engines maintain constant thrust
as altitude increases.

It may be a convenient simplification, but jet engines aren't exempt from
the same rules of air density that piston engines abide by.

I thought that the constant thrust part of the jet engine, is that at a
constant altitude, it produces constant thrust with varying speed. Is that
correct?
--
Jim in NC