A Preliminary Design Study of a Quiet Light Observation Helicopter

Abstract

The report presents the results of a preliminary design study and an analytical investigation of noise-reduction measures for the OH-58A Light Observation Helicopter (LOH). The purpose was to establish what degree of quieting is possible and what penalties in performance and mission capabilities are associated with the application of noise-reduction measures. Design data are presented for four configurations. Two are test/demonstrator versions suitable for a flight-test program to verify the predicted noise reductions. The other two configurations incorporate design changes to give an operational quiet LOH the same payload and performance as the OH-58A. Design data, performance, and noise levels for all the study configurations are summarized. A program of design modification and tests to confirm the predicted noise reductions is presented.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1969
Accession Number
AD0867010

Entities

People

  • Charles R. Cox
  • Dennis R. Halwes
  • Eugene L. Brown

Organizations

  • Bell Flight

Tags

Communities of Interest

  • Air Platforms
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Aircraft Equipment
  • Aircrafts
  • Airframes
  • Aluminum Alloys
  • Army Aviation
  • Control Systems
  • Flight Speeds
  • Mach Number
  • Manufacturing
  • Measurement
  • Noise Reduction
  • Observation
  • Observation Aircraft
  • Plastic Explosives
  • Recording Systems
  • Sea Level
  • Tensile Strength

Fields of Study

  • Physics

Readers

  • Acoustics.
  • Aerospace Engineering
  • Systems Analysis and Design