Effect of Radial Load Distribution on the First-Harmonic Inflow Velocity of a Helicopter Rotor at Transition Speeds,

Abstract

A joint Navy/NASA experimental investigation was conducted in October 1983 in the Langley Research Center VSTOL Wind Tunnel to test the hypothesis that helicopters with unusually hub-weighted radial load distributions should experience a more severe first harmonic inflow velocity field during transition than ordinary helicopters. This report presents an approximate analysis of the experimental results. The hypothesis is strongly supported. Compared to the rotor configuration with the most tip-weighted load distribution, the configuration with the most hub-weighted distribution appears to have experienced an approximately 50 percent greater first-harmonic inflow at a 50 percent greater critical flight speed. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1984
Accession Number
ADA142840

Entities

People

  • David W Taylor
  • H. R. Chaplin

Tags

Communities of Interest

  • Air Platforms
  • Human Systems
  • Space

DTIC Thesaurus Topics

  • Agreements
  • Diameters
  • Equations
  • Experimental Data
  • Flight Speeds
  • Helicopters
  • Load Distribution
  • Measurement
  • Measuring Instruments
  • Momentum
  • Plastic Explosives
  • Polyethylene Glycols
  • Ships
  • Strain Gages
  • Stratified Fluids
  • Test And Evaluation
  • Wind Tunnels

Fields of Study

  • Physics

Readers

  • Aerospace Engineering
  • Fluid Mechanics and Fluid Dynamics.
  • Statistical inference.