Quote:
|
Originally Posted by JL8Jeff
You're missing it completely. If the conveyer moves backwards at the same speed the plane is accelerating forward then the plane itself isn't moving. It has nothing to do with wheels or friction. The plane is riding on it's wheels as it tries to move forward but the conveyer is counteracting the forward roll. So the plane stays in the same place. It's the same as me getting on my bike and riding it on a treadmill(which I do, we have a bike roller setup). I'm sitting in my living room doing 25 mph on the treadmill but there's no breeze blowing on me. So the plane would be in the same situation, no air across the wings, no lift. I know you'll get it eventually!  |
youre the one thats missing it.
You can ride your bike like that on a treadmill, because the wheels on your bike are what move it, they drive it forward, they push off the surface in order to move. thats why you stay stationary. With a plane, it pushes off the air by using jet engines/a propellor, so the wheels underneath have no effect on the speed of the plane.
Say the plane is going 300mph at takeoff, that would mean the conveyor is moving 300mph int he opposite direction, making the effective speed of the wheels 600mph. this is because the plane isnt driven by the wheels! youll get it eventually.
