ORIGINAL: Charley
ORIGINAL: togatoga
Agreed, most planes are rated to max t/o and ldg altitude due to expected performance shortfall in engine thrust and lift.Its called WAT. However, when comparing rpm figures its rather close wrt msl and at altitude.
What happens is a significant drop in thrust available even as the rpm remains the same.The engine cannot produce its flat rated power band above a specified altitude and temp.
Nice to see a post that relates to the subject of the thread. We've had plenty of thread drift.
CR
Ahhh, but hasn't it been fun even with a few trick questions added in along the way????
Some of us might have gotten the impression that the OP was really wondering about power output changes at higher altitudes when he asked about RPM changes.
I think it's been covered really well, but if all the OP was really interested in is the RPM numbers, that's been answered too along with the why....[8D]