- My point was that as the air really thins out you simply have nothing to move.
a reaction engine works better and a rocket really comes into it's own. I have run into discussions where some modelers believe that rpm readings on a given engine improve at higher altitudes .
If you persue this argument - you have a condition where the prop goes fastest as the engine looses all power. In real world the engine loses and the prop working in thinner air gives fairly close readings for the same setups.
The hooker tho is that the aircraft must go faster to produce the same lift. and the engine is producing less power
If you fly an aerobatic model (contest type stuff)
at 7000 ft elevation and at sea level- the results are extremely different
You have to readjust and compensate for speed variance.
Just like a car at sea level and when going over the contenental divide.
Less air resistance up high but no power to move the car.