A Flight Investigation of Short-Period Longitudinal Oscillations of an Airplane with Free Elevator

Abstract

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.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1942
Accession Number
ADB803903

Entities

People

  • William H. Phillips

Organizations

  • National Advisory Committee for Aeronautics

Tags

DTIC Thesaurus Topics

  • Aerodynamic Forces
  • Aeronautical Laboratories
  • Aircrafts
  • Airplanes
  • Amplitude
  • Boundaries
  • Center Of Gravity
  • Coefficients
  • Control Sticks
  • Control Surfaces
  • Control Systems
  • Dynamic Pressure
  • Equations
  • Equations Of Motion
  • Flight Speeds
  • Instability
  • Moment Of Inertia

Readers

  • Aerodynamics/Aeronautics.
  • Theoretical Analysis.