STATIC LONGITUDINAL STABILITY AND CONTROL OF A CONVERTIBLE-TYPE AIRPLANE AS AFFECTED BY ARTICULATED- AND RIGID-PROPELLER OPERATION

摘要

The results of an investigation in the Langley full-scale tunnel of the static longitudinal stability and control of a convertible-type airplane (combination helicopter and airplane) as affected by articulated-and rigid-propeller operation are presented in this paper. The investi¬gation included force measurements for a very large angle-of-attack range (from 12° to 90°) of the model with the all-movable horizontal tail installed and removed. The flight attitudes investigated include normal-flight conditions with full power applied and the convertible-flight region at high angles of attack including the transition to the hovering condition. The effects of ailavator and stability-flap deflection on control-surface effectiveness and on hinge moments were determfned. The effects of propeller slipstream on the ailavator effectiveness at a static condition and at an angle of attack of 90° for low relative veloc¬ity conditions were also determined.