...with a complicated answer. Hi everyone, In short, what actually causes air to accelerate over the top of a wing? In long, the often taught "equal transit time" theory that airflow at the top travels a longer distance and therefore must accelerate to reconnect to the bottom flow is incorrect. This is easily disproven by the fact that symmetrical airfoils with no camber do generate lift (although not all lift is the result of Bernoulli's principle), and also this video: As the airflow splits at the stagnation point, it accelerates over the top surface up to the minimum pressure point which is usually found near the wing's maximum thickness/curvature point at low AOAs. There is definitely a relationship between the geometry of the airfoil and the velocity of the air traveling over it, but why? The internet and books are full of contradicting information and yet this is one of the fundamentals of lift. Thanks!