FORCE-TEST INVESTIGATION OF A MODEL OF AN AERIAL VEHICLE SUPPORTED BY FOUR UNSHROUDED PROPELLERS
NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC
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A wind-tunnel investigation was made to study the static longitudinal and lateral stability and trim characteristics of a simplified model of an aerial vehicle supported by four unshrouded propellers that were fixed with respect to the airframe so that the propeller plane of rotation was horizontal for hovering flight. The investigation showed that this unshrouded-propeller configuration required half the nose-down attitude for forward flight, experienced about half the nose-up pitching moment, and had about half the attitude instability of a shrouded-propeller configuration of the same general size. The results also showed that horizontal and vertical tails were required to give satisfactory stability and trim characteristics at the higher forward speeds.
- Research and Experimental Aircraft