Abstract
A closed-form analytic solution for the downwash induced on an aft tail by the main wing of an airplane is presented. This infinite series solution is based on Prandtl's classical lifting-line theory and accounts for the effects of wing planform shape, as well as tail position and vortex rollup. The results obtained from the present analysis reduce to the known solution for an elliptic wing. Results for a tapered wing are also presented. This infinite series solution applies only to a main wing with no sweep or dihedral. However, an approximate correction is presented, which can be used with some caution for swept wings
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