Hello, I have been doing some mock exams on the Microisland website
Aircraft Techinal
And here, the answer to how much lift is generated from the upper surface of a wing, is opposite to what I have read in my textbook. As I understand it, two thirds of lift is generated from the lower relative air pressure on the upper surface of the wing, and one third from the airflow being deflected downwards by the lower surface of the wing.
The screengrab below however, has the answer different:
So, am i missing something, or is the exam wrong?
Cheers