ESTIMATED STATIC STABILITY AND CONTROL CHARACTERISTICS
GENERAL ELECTRIC CO CINCINNATI OH ADVANCED ENGINE AND TECHNOLOGY DEPT
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The XV-5A is a two-engine, two-place VSTOL research aircraft with a design gross weight of 9200 pounds and an aspect ratio 3.42 wing of 260 square feet. In conventional flight mode the aircraft has a power-off flaps-down stall speed of 89 knots and a design maximum speed of 450 knots. In fan flight mode the aircraft can sustain flight at any speed from hovering to speeds in excess of conventional stall speed. The report represents an estimate the XV-5A aerodynamic characteristics, based on theoretical and empirical considerations, including the results of 420 hours of wind tunnel tests of 18 and 16 scale models. In the fan flight mode, the aircraft is estimated to be statically unstable in pitch with the most aft cg at low speeds below approximately 70 knots but with an increasing stability with speed to the conversion speed where the stability level corresponds to that for conventional flight. The aircraft possesses positive lateral and directional static stability with sideslip at all forward speeds in fan-powered flight and the effectiveness of the conventional flight control system is shown to be unaffected by fan operation. The exit louver control system is capable of providing the required propulsive force for acceleration of the airplane from a minimum of 10 knots rearward to conversion speed and provides a thrust attenuation of up to 22 for hovering lift control.
- Research and Experimental Aircraft