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Originally Posted by Ian
the belt CAN NOT affect the thrust of the turbines. they do not interact with eachother at all, not even indirectly.
the best possible example I could give you would be waterskiing from a helicopter. you can go against the flow of water and guess what, you're moving forward. the thrust of the helicopter is not affected by the direction of the water. the skis are like the wheels on the plane, they merely ride along the surface.
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i know what turbines do. I think you fail to realize that a plane must reach a certain speed to take off. if the airplane is in a belt and is moving forward and turbines are pushing it UNTIL it reaches the rotate speed it's connected to the ground! If it remains on the belt and it counteracts its advances forward that means that INDICATED, CALIBRATE, TRUE, and GROUND speed will be ZERO! a convetional airplain WILL NOT take off with a ZERO airspeed.