[gr8eman]

No prop (that is used for airplanes) can maintain thrust at 33k ft...Atmospheric physics. Radar cross-sections for props and jet engines are completely different...wave physics.

[NorthMountain]

Airbus A400M lists a service ceiling of 37,000 ft.

C130 Hercules lists a service ceiling of 33,000 ft.

The Embraer and Short (Super) Tucano lists a service ceiling of 34,000 to 35,000 ft.

The Beech Super King Air service ceiling is 35,000 ft.

Piper Cheyenne almost makes 36,000 ft.

Those must not be prop airplanes. Because No prop (that is used for airplanes) can maintain thrust at 33k ft.

[diogenes ghost]

"No prop (that is used for airplanes) can maintain thrust at 33k ft...Atmospheric physics."

I suggest you retake that physics class....and pay attention this time. Your statement is grossly in error.