[MagicHef]

Originally Posted by cdcox

Force of jets - rolling resistance = large positive number

(large positive number) / (mass of jet) = acceleration

Lets say after 1 second, the jet is moving at 1 mph.

Jet speed 1 mph and gaining. Wheel speed 1 mph. Treadmill speed = 0.

Now start your treadmill. Run it at 100 mph.

Jet speed 1 mph and gaining. Wheel speed 101 mph. Treadmill speed = 100 mph.

Double the speed of the tread mill, same thing. Meanwhile, the jet just keeps on picking up speed relative to the ground.

The tread mill is just making the jet wheel free spin. The force of the engines cannot practically be overcome by spinning the wheels faster. Just like you can't break the rope by spinning the treadmill faster under the shopping cart. You just can't generate the force.

Thank you for including that. I agree completely. The problem is that the scenario is in no way practical.