Accession Number : AD0657321

Title :   EFFECTS OF GUST VELOCITY SPATIAL DISTRIBUTIONS ON LATERAL-DIRECTIONAL RESPONSE OF A VTOL AIRCRAFT.

Descriptive Note : Final rept. Oct 65-Feb 67,

Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Swaim,Robert L. ; Connors,Alonzo J.

Report Date : JUN 1967

Pagination or Media Count : 37

Abstract : The effects of spanwise distribution of longitudinal and vertical components of gust velocity and longitudinal distribution of the lateral component on the lateral-directional response of a hovering VTOL aircraft are analyzed. Results show that spanwise effects of the longitudinal and vertical components are negligible, and the longitudinal distribution of the lateral component is significant in computing the power spectral densities of gust-induced side force, yawing moment, rolling moment, and the aircraft sideslip, yaw, and roll root-mean-square response angles. If the gust-induced angles of attack and sideslip angles are in the nonlinear range of lift curve slope, the above conclusions, which are based on linear aerodynamic theory, may not hold and an analysis based on momentum transfer of gust energy to the aircraft is recommended. Flow field interaction effects due to engine intake and exhaust also were not considered. (Author)

Descriptors :   (*VERTICAL TAKEOFF AIRCRAFT, *GUST LOADS), (*ROLL, HOVERING), VELOCITY, MOMENTS, YAW, TURBULENCE, FLIGHT CONTROL SYSTEMS, EQUATIONS OF MOTION, FUSELAGES

Subject Categories : Aerodynamics
      V/STOL

Distribution Statement : APPROVED FOR PUBLIC RELEASE