> Not the cross section shape - ok, if you have a cross section shape that is circular it will not work.
--It will if the circular shape is rotating in a 'topspin' direction.... :-)
But as far as you note that the curvature could be greater in the bottom face of the wing (the negative or reverse camber), we could dismiss the widespread talk that the air flowing faster over upper face of the wing than over the bottom face creates a differential pressure (by Bernouilli effect) that creates lift.