Accession Number : AD0697177

Title :   TABLES OF AERODYNAMIC DERIVATIVES OF OSCILLATING ROTOR BLADES IN HOVERING FLIGHT,

Corporate Author : TEXAS A AND M UNIV COLLEGE STATION DEPT OF AEROSPACE ENGINEERING

Personal Author(s) : Rao,B. M. ; Jones,W. P.

Report Date : JUN 1969

Pagination or Media Count : 56

Abstract : A theory was developed for determining the influence of compressibility on the aerodynamic forces acting on helicopter rotor blades when oscillating in hovering flight. In this theory, the usual two-dimensional mathematical model of the flow was adopted in which a section of the reference rotor balde and its helical wake are replaced by an airfoil with a straight wake and a system of regularly spaced infinite wakes below, the amount of spacing depending on the downward flow induced by the rotor and the number of blades. In this report, the same theory is used to compute the aerodynamic derivative coefficients referred to the quarter-chord point on the airfoil. The results obtained are tabulated for single and two-bladed rotors for a range of values of the parameters involved. (Author)

Descriptors :   (*HELICOPTERS, HELICOPTER ROTORS), (*ROTOR BLADES(ROTARY WINGS), AERODYNAMIC CHARACTERISTICS), HOVERING, MATHEMATICAL MODELS, WAKE, LIFT, PITCH(MOTION), OSCILLATION, TABLES(DATA)

Subject Categories : Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE