
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 twodimensional 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 quarterchord point on the airfoil. The results obtained are tabulated for single and twobladed 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