Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-14T05:19:02.292Z Has data issue: false hasContentIssue false
  • English
  • Français

The coming era of the quiet helicopter

Part of: Sustainable Aerospace

Published online by Cambridge University Press:  04 July 2016

Thomas R. Stuelpnagel
Thomas R. Stuelpnagel*
Affiliation:
Hughes Helicopters
Get access Rights & Permissions [Opens in a new window]

Extract

The subject of the quiet helicopter is receiving increasing attention throughout the world because it is now established that a helicopter can be made quiet. Quietening is also needed as more helicopters are being used over cities and residential areas. To date, little attention has been paid to helicopter quietening because the emphasis has been on achieving maximum payload and other performance. Now that the basic helicopter design has been established, refinements for quietening are becoming practical. The comparison is much like the evolution of the automobile and the truck in the city. Initially these vehicles were noisy. As their number increased and their design evolved, mufflers and sound-deadening materials were skilfully applied to reduce their noise to more acceptable levels for each type vehicle.

Type
Research Article
Information
The Aeronautical Journal , Volume 79 , Issue 780 , December 1975 , pp. 532 - 536
Copyright
Copyright © Royal Aeronautical Society 1975 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Stuelpnagel, Thomas R. The helicopter is coming to town. Hughes Helicopters paper presented at the 1975 Helicopter Association of America Convention.Google Scholar
2. Hirsh, N. B. and Ferris, H. W. Design requirements for a quiet helicopter. American Helicopter Society, Washington DC, May 1972.Google Scholar
3. Barlow, W. H., McClusky, W. C., and Ferris, N. W. OH-6A phase II quiet helicopter program. US Army Air Mobility R & D Laboratory, September 1972, Report No 72-79.Google Scholar
4. Robinson, Frank. Component noise variables of a light observation helicopter. US Army Mobility R & D Laboratory for NASA, 1973, NASA CR-114761.Google Scholar
5. Wagner, R. A. Noise levels of operational helicopters of the OH-6 type designed to meet the LOH mission. US Army Air Mobility R & D Laboratory for NASA, 1974, NASA CR-114760.Google Scholar