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3.10.3 How Much Lift? The Kutta-Zhukovsky Theorem
Here is a beautifully simple and powerful result: The lift is equal to the airspeed, times the circulation, times the density of the air, times the span of the wing. This is called the Kutta-Zhukovsky theorem.
Lift = airspeed Ѓ~ circulation Ѓ~ density Ѓ~ span
Since circulation is proportional to the coefficient of lift and to the airspeed, this new notion is consistent with our previous knowledge that the lift should be proportional to the coefficient of lift times airspeed squared.