COMBINED EFFECTS OF WING TAPER RATIO AND LOWnHORIZONTAL-TAIL POSITION ON LONGITUDINAL STABILITY OF A 45°SWEPTBACK WING-BODY COMBINATION AT TRANSONIC SPEEDS

摘要

The combined effects of wing taper ratio and low horizontal-tail position on the static longitudinal stability of a ^5° sweptback wing-body combination with an aspect ratio of approximately 4 have been inves¬tigated for a range of Mach numbers from 0.8 to 1.2 in the Langley 8-foot transonic pressure tunnel.nThe initial destabilizing tendency exhibited by the wing-fuselage combination is reduced as the wing taper ratio is decreased from 0.31 to 0. The addition of a horizontal tail in a low position does not eliminate this destabilizing tendency. Although the horizontal tail contributes to the stability at all Mach numbers and angles of attack investigated, the amount of the horizontal-tail contribution decreases as the wing taper ratio is decreased. Large stability changes with Mach number occur for all configurations.