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This question is circulating around different forums, and the responses are always very diversified. Lets see what you guys think:
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in opposite direction).
The question is:
Will the plane take off or not? Will it be able to run up and take off?
Think about it, the engines are pushing the plane physically forward, thrusting through the air. The wheels have no influence on the motion, they just roll. With this setup they'll roll twice as fast, sure, but the plane will still move forward and take off the exact same.
right, but as long as the wheels are on the ground, they bear the weight of the plane. as long as they bear the weight of the plane, they have traction. since they have traction on the belt, the belt pushes the plane backwards at exactly the same speed that the plane is moving forwards. the plane must make actual physical progress forward to lift off.
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sure, the engines would have thrust, but the plane would still have no velocity which means no air to move over the wings which means no lift. unless the conveyer creates some kind of wind the plane is staying on the ground.
edit: I like c1aptons car on dyno visual. car has power to thw wheels but the wheels spin on tracks and the car does not gain speed.