Theory of lifting surfaces

L. Prandtl
Aug 1920

The determination of the resistance W (subscript 12) due to the influence of a wing 2 on a wing 1, is obtained by calculating by means of equation (14) and speed W (subscript 12), due to a wing 2 at a point situated in the same plane as the lifting screw, this plane being perpendicular to the direction of the stream.

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