Quote Originally Posted by Ruiner
Your logic is still off. It has NOTHING to do with how fast the wheels are spinning, NOTHING. As I said earlier, a plane could take off with NO wheels on the snow or no wheels in the water or locked wheels on a sheet of ice.

The plane has to overcome the friction produced by the wheels. Since the wheels are free spinning, then the only friction that they are producing comes from the bearings... that's it. Once it overcomes that little bit of friction, the plane moves forward.
i think maybe you're misunderstanding me or i didn't explain myself well enough? i understand the speed of the wheels have nothing to do with this equation, it's all about the force that's being applied by the engines. however, and please tell me if this is where i'm wrong, i believe the wheels must spin at a higher rate than the treadmill moving against it AS A BYPRODUCT of the force being applied to move the plane forward. because if this is not the case, then why is it that the wheels would freely spin at twice the rate of the treadmill? hope this clears it up for good