A Simplified Method for Determining from Flight Data the Rate of Change of Yawing-Moment Coefficient with Sideslip

Abstract

A method is presented by which the directional stability derivative C sub n sub Beta, the rate of change of yawing-moment coefficient with sideslip angle, can be evaluated for a conventional airplane from flight records of a lateral or directional oscillation. For the method shown, the calculation of C sub n sub Beta for a particular high-speed-flight condition reduces to the determination of only the moment of inertia about the Z-axis and the period of a sideslipping, yawing, or rolling oscillation. When applied to conventional airplanes flying at low to moderate lift coefficients, the assumptions involved in this simplified method produce negligible error. A comparison of C sub n sub Beta as determined in flight and in the wind tunnel shows good agreement for the four conventional airplanes considered.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1946
Accession Number
ADA801342

Entities

People

  • Harvard Lomar
  • Robert C. Bishop

Organizations

  • National Aeronautics and Space Administration

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Aeronautical Laboratories
  • Aeronautics
  • Agreements
  • Aircrafts
  • Airplanes
  • Center Of Gravity
  • Coefficients
  • Dynamic Pressure
  • Flight
  • High Lift
  • Inertia
  • Measurement
  • Moment Of Inertia
  • Oscillation
  • Sideslip
  • Wind Tunnels

Readers

  • Aerodynamics/Aeronautics.