Dear Sirs!
thank you very much the useful explanations.
So we are talking about DOWNWASH (and upwash also offcourse) and INDUCED AOA, which generates thise phenomenon.
May I ask you to give me a final acknowledgement on the following sum statament? Offcourse finally I will write it in Hungarian, so do not deal with my english grammar this time
"Although a "dirty" wing stalls at a lower AOA, the AOA indicator will indicate a higher critical AOA than in case of a "clean" wing, because of the 3 dimensional airfow and downwash produced massive increasement in the induced AOA."
this is worng