WIND-TUNNEL TESTS OF A 0.16-SCALE MODEL OF THE X-3 AIRPLANE AT HIGH SUBSONIC SPEEDS. - ADDITIONAL STABILITY ANDnCONTROL CHARACTERISTICS AND THE AERODYNAMIC EFFECTS OF EXTERNAL STORES AND RAM JETS

摘要

Additional wind—tunnel tests of the 0.16—scale model of the X—3 airplane have been made at low and high subsonic Mach numbers to investigate the lateral— and longitudinal—stability and —control characteristics. The X—3 is a research airplane incorporating a low—aspect—ratio wing and tail with sharp leading and trailing edges and is designed for supersonic speeds.nThe results of the tests show a stable variation of all-moving—tail incidence with Mach number for Mach numbers less than about 0.85. Deflecting the wing leading—edge flaps， in general, reduced the Mach number range for this stick—fixed static stability and increased the negative tail incidence required to trim the airplane in level flight.