DISCUMER NOTICE When Covtntnt iravings, •ptclfication«, or other data are used for •ny purfott other then in connection with e definitely related Govemnent procureawnt operation, the United States Government thereby incurs no responsibility nor any obligation whatsoever; and the fact that the Goventaent «ay have foraulated, furnished, or in any way iupplied the said drawings, specifications, or other data Is not to be ragarded by laplication or otherwise aa in any manner licensing the holder or any other person or corporetlon, or conveying any rights or penslstlon, to manufacture, use, or sell any patented invention that «ay in any way be related thereto. DDC AVAIUBILITY NOTICE Qualified requesters «ay obtain copies of this report from Defense Docuasntation Center Cameron Station Alexandria, Virginia 22314 * * * Ulla report has been released to the Office of Technical Services, FOREWORD During the course of the experimental portion of this work it was found advisable to rework the control vanes in the P-CEM. These vanes, essentially butterfly valves, were originally pivoted about their 50" chord point and as such were unstable. N't-w vanes pivoted at 25' chord not only improved control-feel and effectiveness but eliminated a control-system-induced instability of the craft. The modified P-GEM showed a marked increase in static stability, the value of "/D for neutral stability in hover being increased from .05 to .08. The replacement of the constantly fluttering unstable vanes with the new stable system also reduced lift horsepower required as can be seen in Figure 18 of this report. For this reason, previously run flight tests were repeated to enhance the validity of this report.
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