How is this even a question. The wings of the plane create lift. If they don't move in relation to the air around them, no lift. If the treadmill moves backwards as fast as the plane moves forwards, the plane is stationary to the wings.
Essentially, the plane needs to be able to move forward on the treadmill the same speed as it would to normally take off. That means if the plane takes off at 200 mph, and the treadmill moves back 100 mph, the plane will need to go forward at 300mph in relation to the tread mill.
Essentially, the plane needs to be able to move forward on the treadmill the same speed as it would to normally take off. That means if the plane takes off at 200 mph, and the treadmill moves back 100 mph, the plane will need to go forward at 300mph in relation to the tread mill.
