A Flight Investigation of Short-Period Longitudinal Oscillations of an Airplane with Free Elevator
NATIONAL ADVISORY COMMITTEE FOR AERONAUTICS LANGLEY FIELD VA LANGLEY AERONAUTICAL LABORATORY
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Flight investigation has been made to check results of theoretical analysis of longitudinal stability of airplane with free controls. Tests were made of Fairchild XR2X-1 airplane on which weight moment and aerodynamic balance of elevator were varied to bring it into a condition where unstable short-period oscillations were encountered. Amounts of aerodynamic balance and weight moment required for instability were found to be greater than amounts predicted by theory. Time histories of oscillations are included to show nature of instability.