Originally Posted by
balsa model
Is there an airfoil shape that does produce (non-zero) lift and yet has the aiflow above its upper surface move at the same speed as the airflow below its bottom surface? A kind of "non-Bernoulli" airfoil.
I'm quite confident in saying: No, that doesn't exist.
Because at the same time the other theories will provide zero as well:
Same Speed above and beklow means => no circulation (obviously) and also no net vertical component behind the wing, because that would require more mass flow and thus flow velocity above the wing than below.
So, I give you a 'No'.