first of all I thank you for your quick and extensive answer.
but I didn't quite understand what "tangential discontinuity" means.
(english in not my native tounge =\ )
How does the principle of equal transit times works?
the Bernoulli principle explains lift by high speed = low pressure but these relays on the fact that two particles of air living the same point A will arrive at the same point B at the same time and this is explained by the "principle of...