INVESTIGATION OF THE THWAITES AIRFOIL PRINCIPLE AS APPLIED TO HELICOPTER ROTOR BLADES

Abstract

A performance calculation has been carried out for the purpose of comparing the Piasecki XH-16 rotor vith the Karman-Yuan rotor. The two rotors ,atre asi%ned identical in size and lifting capacity (rotor diameter 82 ft, gross weight 36600 lbs). The Piasecki rotor blade is equipped with an NACA 0015 airfoil and the Karman-Yuan rotor blade vith an elliptical airfoil of 18% thickness chord ratio and cyclic flap control. The controllable lift distribution along the blade span of the Karman-Yruan rotor is achieved by varying the spanwise flap location and applied boundary layer suction. Due to the high lift coefficient employed in the Karman-Yuan rotor blade it was found that a lower rotational speed can be used to sustain the same gross wieght as does the XH-16.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1954
Accession Number
AD0046678

Entities

People

  • L. Arnold
  • S. W. Yuan

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aerodynamic Configurations
  • Air Force
  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Boundary Layer
  • Control Surfaces
  • Differential Equations
  • Flaps (Control Surfaces)
  • Fluid Dynamics
  • Helicopter Rotors
  • Helicopters
  • High Lift
  • Hydrodynamics
  • Periodic Variations
  • Pressure Gradients
  • Turbulent Flow

Fields of Study

  • Physics

Readers

  • Aerodynamics/Aeronautics.
  • Immunology
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).