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Originally Posted by wu_trax
So the air is moving through the jetengine twice as fast because the plane is standing on a treadmill?
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No. The treadmill has absolutely zero effect on the movement of the aircraft through the air, which is the whole crux of the problem.
Imagine the plane standing on the treadmill and revving it's engines up to a speed to sustain a speed of 10mph. What happens? The plane will be pulling itself through the air with a speed of 10mph and thus be moving forward. The treadmill will be rotating backwards at the same speed, so that's 10mph in the opposite direction, or -10mph. The difference between these is covered by the wheels, which will rotate at a speed of 20mph.
As such, the plane is moving forwards at a speed of 10mph, and creating airflow as per normal.