Why do rockets have stages that eject at different atmospheric pressures? Your gonna answer your own question if you look honestly. So heres a question for you, if there is no gravity holding us down and it's all spin 1) how does the atmosphere stay on and not spin off? And 2) how does any flying object experience enough lift to fly on a flat earth? And 3) how is friction from wind/atmospheric resistance explained in a flat earth model? With a rotating disk, or bowl, even with partial gravity you should experience variations in lift as you turn away from or into the spin of the disc.