Abstract

SummaryTheoretical data from lifting-surface theory are presented to illustrate(i) that the vortex drag factor is closely related to the half-wing spanwise centre of pressure on simple planforms without camber or twist,(ii) that lifting-line theory is useless for predicting the spanwise distribution of vortex drag on swept wings,(iii) that recent numerical improvements in lifting-surface theory help to reconcile the concepts of wake energy and leading-edge suction in relation to vortex drag.

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