Quote Originally Posted by Hektik
correct but the engines only propelle the jet forward creating an upforce on the wings wich are what lifts the jet. just like when u drive in the car and hold ur hand out of the window the higher the speed the harder it is to lower ur hand becasue the forward thrust is what is causing ur hand to lift same thing with a jet the engines push forwrd and the wings lift.
Yes, we all know what causes lift. What I am showing IA.com is that the treadmill moving backwards WILL NOT affect the forward movement of the plane.