I've been working on a research paper, and I haven't been able to find a solid description of this. Why does a downward aileron cause a higher angle of attack, and likewise an upward aileron causes a lower angle of attack? Is it the same as the reason why flaps cause a higher angle of attack, by effectively extending the chord line?
Draw the chord line from the tip of the airfoil to the tail of the movable surface - if the aileron or flap goes down, the back of that line goes down - that is an increase in the geometric angle of attack. The chord line rotates.
Flap, aileron, same effect. https://www.boldmethod.com/blog/lists/2019/05/five-aerodynamic-facts-you-should-know-about-flaps/
