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Originally Posted by GreatWhiteEbola
The thrust doesn't create lift until it counteracts gravity
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Thrust doesn't create lift, it moves the plane forward. Lift is created by the wings, with more lift being generated the faster the plane goes forward (well that and wing geometry and angle of attack and stuff, but keeping it simple for argument's sake).
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the relationship between the runway and wheels is key. Gravity will prevent liftoff as there will not be adequate high/ low pressure differentiation on the airfoil.
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The only relationship between the treadmill surface and the wheels is that one will cause the other to turn.
Yes gravity will prevent liftoff if there is not enough lift, but what would cause there to not be enough lift? Once the airplane reaches the appropriate airspeed it will take off, so for the plane to not be able to take off, something has to stop it from moving forward. What's stopping it from moving forward?