Well....
I did a lot of research on the subject and my statements above are wrong! So this post is not solved unfortunatelly.
So please can you please explain the following contradiction (point 1 against point 2) in a detailed aerodynamic description?
Point 1: The ACTUAL streamlines give a higher AOA when stalling with flaps, than with CLEAN stall (experiencing the indication of an AOA indicator instrument).
Point 2. Despite with flaps the critical AOA is a slightly lower, and the pitch is lower compared to the CLEAN stall.
Some hints (but not enough for me to completely understand the issue)
The effect of changing the camber when flaps deployed is the increase of zero lift angle and this way the absolute AOA too. The increase in absolute AOA is much more larger then the decrease of critical AOA. But how is it possible that this absolute AOA is manifested in the reality? For example an angle of attack indicator displays a higher AOA with flaps than with CLEAN...
Please help
Last edited by gundernak; 4th Jul 2017 at 22:20.