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I think some people are imaging that the plane is just supposed to hover up off the treadmill in the same location in which it began. It still need a proper distance to build up speed to generate lift, so this treadmill/runway needs to be long enough. The thrust from a jet engine doesnt care what it is sitting on. Be it 200mph on stable ground or 400mph on a treadmill, as long as the wheels can withstand the rpm's while the plane covers enough distance to generate lift, it makes no difference to the jet engine.
Edit. Pretend the wheels are frictionless. The plan can maintain its location on a 200mph treadmill without even using any kind of thrust. When it does begin to propell itself, it is no different than if it was sitting on stable ground
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Last edited by Autospirit : 12-13-2007 at 10:14 AM.
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