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Q:

How does the stall reduces the total lift?

A:

It's easiest to imagine that the airflow over the wing is attached to the wing itself, sliding smoothly over the airfoil. If the angle of attack is too dramatic, this flow separates from the wing, creating a space of turbulent air. This will reduce the lift, since smooth, fast, low-pressure air is no longer being created.  This is called a stall, when drag becomes stronger than lift. During a stall, the pilot can easily lose control of the aircraft.

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