An electromagnetic-analogy modal of the vortex load, esti¬mated from lifting-line theory with an arbitrary fairing near the elevator tip, on a thin elliptic horizontal tail surface of aspect ratio 3 with a 0.5-chord 0.85-span plain elevator was constructed and tested. The aspect-ratio corrections to the lift and hinge moments were calculated from the measured results.nA comparison of the aspect-ratio corrections for the partial-span elevators was made with those previously presented for full-span elevators. The comparison indicates that the incremental difference in the lift parameters between the full-span and the partial-span elevators may be estimated satisfactorily by lifting-line theory. The incremental difference for the curve of hinge-moment coefficient against angle of attack is usually small.
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