mach nr vs weight:
Studying the "Ace the techical pilot interview" book and there is a statement in there that makes me totally confused:
What happens to Mach nr on a long leg when weight decreases and all other factors remain constant. Temperature, Pressure alt (FL) and thrust is constant...
The book say mach nr will decrease in this case........ ??????
If weight decrease- required lift decrease - induced drag decrease. Less drag with constant thrust will give a higher TAS and HIGHER Mach nr.... in my opinion.
Someone show me the way out of this fog..