Accession Number : AD0664689

Title :   STUDY OF ROTOR CONFIGURATIONS FOR MINIMUM POWER AND ROTOR-WAKE PRESSURE DISTRIBUTIONS.

Descriptive Note : Final rept. Jun 66-Sep 67,

Corporate Author : CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s) : Tung,C. ; Brady,W. G.

Report Date : SEP 1967

Pagination or Media Count : 30

Abstract : Two independent tasks are included as follows: Task I - Develop a method for analytically determining rotor planform and twist distribution to minimize the power required by a hovering or slowly advancing rotor. Task II - Predict the time-varying pressure distribution on a smooth surface due to a hovering rotor. Under Task I, the mathematical developments required were completed and are discussed. The Task II effort was made in support of research being carried out concerning the transmission of sound energy across a water interface. Digital computer calculations of the unsteady static pressures on a smooth ground plane directly beneath a hovering rotor were performed for two separate rotor configurations. (Author)

Descriptors :   (*HELICOPTER ROTORS, AERODYNAMIC LOADING), WAKE, PRESSURE, DISTRIBUTION, PERFORMANCE(ENGINEERING), THRUST, TWIST(AERODYNAMICS), AERODYNAMIC CONFIGURATIONS, ROTOR BLADES(ROTARY WINGS), HOVERING, SOUND TRANSMISSION, UNDERWATER, DOWNWASH, POWER, DIGITAL COMPUTERS

Subject Categories : Helicopters
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE