John J. Harper
A summary of force data on unswept and sweptback airplane control surfaces is presented. Lift and hinge-moment characteristics were determined for four unswept, semispan control surfaces, and lift, drag, hinge moment, and pitching moment were determined for two semispan, sweptback control surfaces. These control surfaces were tested in the 9-foot wind tunnel of the Daniel Guggenheim School of Aeronautics at the Georgia Institute of Technology and were of the wide-chord type suitable for use as elevators or rudders.
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