Air Speed vs Ground Speed.

The plane is in 1 place, even if it's going 1,000mph Ground Speed because the runway is travelling at the same speed in the opposite direction. There is no lift being generated by the flow of air over the wings, because there is no flow of air over the wings - The plane with regards to the air around it is standing perfectly still. 0mph Air Speed.

That's the way my brain sees it anyway! smile

What happens when you strap a car to a Dyno - There isn't any air flowing over the car, why would anyone think the car would take off if it had wings strapped to it! lol.