SOME EFFECTS OF TAIL HEIGHT AND WING PLAN FORM ON THE STATIC LONGITUDINAL STABILITY CHARACTERISTICS OF A SMALL-SCALE MODEL AT HIGH SUBSONIC SPEEDS

摘要

An investigation has been made in, the. Langley high-speed .7- by 10-foot tunnel to determine some effects of tail height and wing plan form on the static longitudinal stability, characteristics of a complete, small-scale model at high subsonic speeds. The model had both a low-tail position (wing chord plane extended) and a high-tail position (65 percent semispan above the wing chord plane extended). The wings were 4 percent thick, had an aspect ratio of 3, and had various taper ratios and angles of sweep. Three wings had a taper ratio of 0.50 and quarter-chord sweep angles of 25°, 30°, and 35° whereas the fourth wing had 30° of sweep and a taper ratio of 0.20. The Mach number range extended from about 0.80 to 0.94 with corresponding Reynolds numbers ranging from about 1.17 X 106 to 1.29 x 106 for average test conditions.