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Old 08-25-2009, 04:13 PM   #11
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Quote:
Originally Posted by Donger View Post
Then they did not use the same criteria described above.

If the planes wheels are spinning, then the aircraft has no relative ground speed. If if has no relative ground speed, no air is flowing over the aircraft's wings. If no air is flowing over the wings, there is no lift. If there is no lift, the plane will not fly.
But what if the plane uses a propeller to push the wind? Or does the propeller not do that?
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