Accession Number : ADA298305

Title :   Full Scale Investigation of the Aerodynamic Characteristics of a Typical Single-Rotor Helicopter in Forward Flight,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC

Personal Author(s) : Dingeldein, Richard C. ; Schaefer, Raymond F.

PDF Url : ADA298305

Report Date : 1948

Pagination or Media Count : 33

Abstract : As part of a general investigation to obtain rotor characteristics for use by helicopter designers. The forward-flight characteristics of a typical helicopter, which has a single large main rotor a'nd a small torque-compensating tail rotor have been investigated in the Langley full-scale tunnel. Included in the investigation was the evaluation of the resultant forces on the complete helicopter and the power input to the main rotor over a range of thrust coefficients angles of attack, and tip-speed ratios. During a preliminary investigation of the static-thrust characteristics of six sets of rotors (reference 1), the increased performance due to improved surface condition was indicated to be greater than any increase produced by camber or twist. It was decided, there- fore, to investigate also the effect of surface condition on the forward-flight performance of the helicopter. (KAR) P. 5

Descriptors :   *HELICOPTER ROTORS, *AERODYNAMIC CHARACTERISTICS, ANGLES, TUNNELS, HELICOPTERS, SURFACE PROPERTIES, COEFFICIENTS, LEVEL FLIGHT, ROTORS, THRUST.

Subject Categories : Aerodynamics
      Helicopters

Distribution Statement : APPROVED FOR PUBLIC RELEASE