Measurements of the Direct Pitching-MomentnDerivatives for Four Wing Planforms at Transonic Speeds

摘要

Measurements of the direct pitching-moment derivatives mθ and mθ at transonic speeds for two delta and two swept wing planforms are discussed. The tests were made in the N.P.L. 9½ in. high-speed wind tunnel using slotted liners, a Mach number range from M = 0.695 to M = 1.07 being attained. These measurements extend earlier subsonic results obtained with solid tunnel liners into the transonic range.nComparison with theory is made for one of the delta wings and the effect of a body on the other was examined.