[phord]

Here is how I understand how does ( subsonic) airplane flies ( eah its a wallet) seriously I have some charts that show how much the top surface and the bottom surface contribute to lift and this ratio changes when angle of attack changes . The angle of attack is measured not from the chord but from angle that produces zero lift (absolute angle of attack) flat airfoil is more draggy than conventional airfoil so the airfoll portion reduces drag next wing beats air down and finally Bernuilli principle.