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As part of the wing-fuselage interferences investigation in progress in the N.A.C.A. variable-density wind tunnel, a method of eliminating the interference burble associated with critical midwing combinations was investigated. The interference burble of the critical midewing combination was shown to respond to modifications at the nose of the juncture and to be entirely suppressed with little or no adverse effect on the high-speed drag by special leading-edge fillets.
Includes the Committee's Reports no. 1-1058, reprinted in v. 1-37.

Report

United States. National Advisory Committee for Aeronautics

Published: 1939

Total Pages: 16


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The pitching and yawing moments of a vee-type and a conventional type of tail surface were measured. The tests were made in the presence of a fuselage and a wing-fuselage combination in such a way as to determine the moments contributed by the tail surfaces. The results showed that the vee-type tail tested, with a dihedral angle of 35.3 degrees, was about 71 percent as effective in pitch as the conventional tail and had a yawing-moment to pitching-moment ratio of 0.3. The conventional tail, the panels of which were all congruent to those of the vee-type tail, had a yawing-moment to pitching-moment ratio of 0.48.These ratios are in fair agreement with values calculated by methods shown in this and previous reports. The values of the measured moments were produced from 15 to 25 percent of the calculated value by fuselage interference.