Quote Originally Posted by Ruiner
Look at it this way: if the plane was in the air and YOU were making the wheels on the plane spin, would the plane fall out of the air? That's all that the treadmill is doing...spinning the wheels. NOTHING MORE.

Look at the diagram again and you will understand why the wheels spin at the plane's forward speed + the treadmill's speed:

can't see the pic cuz it's being blocked by websense but i understand what you're saying and even though i don't think i'm expressing it correctly, what i'm saying is what you're saying

and to hopefully prove that i do fully comprehend, here's a simple followup question that you can easily answer: would it be possible to have/build a treadmill that will move/accelerate in a manner in which it will actually keep the plane in the same spot and grounded?