Introduction
It is observed that on a three-dimensional, finite wing, the lift over each wing segment (the local lift per unit span, or ) does not correspond merely to that predicted by two-dimensional analysis. Instead, this local amount of lift is strongly affected by the lift generated at the neighboring wing sections.
As such, it is difficult to predict analytically the overall amount of lift that will be generated by a wing of given geometry. The lifting-line theory yields the lift distribution along the span-wise direction, based only on the wing geometry (span-wise distribution of chord, airfoil, and twist) and flow conditions (, ).
Read more about this topic: Lifting-line Theory
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