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Problem 2 Show that on a lifting line of span b and constant circulation I, the drag induced by the starting vortex filament alone

Problem 2 Show that on a lifting line of span b and constant circulation I, the drag induced by the starting vortex filament alone is expressed by 2 [10] where is the distance between the starting vortex and the lifting line. In finite-wing calculations, this drag is neglected. Why?

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