I want to know what values would be realistic for the air velocities both going over the top of an aerofoil and going underneath an aerofoil (that is, the velocity over the top of the wing should be greater than the velocity over the bottom by a reasonable amount). Also, the plane is traveling at a unchanging altitude and is moving at an average velocity of 250 m/s. Sorry if this doesn't really make sense, I just really need to know. I will clarify any questions you may have about this. Thank you guys for your help.