Aaaah... This topic never fails to stir some back-n-forth, around here.
On previous occasions, my confidence in understanding lift has been stripped to pretty much nothing. By "understanding" I mean (for my interests) "being able to predict how changing shape will affect the lift (and L/D)". Without CFD modelling. Preferably without contour integrals either.
Yet today, I would like to ask a simple question:
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 guessing there is not such thing, but I've never seen it stated categorically.
Thank you for the enjoyable reading, as always. Balsa