Hostname: page-component-77c89778f8-sh8wx Total loading time: 0 Render date: 2024-07-21T07:59:15.599Z Has data issue: false hasContentIssue false

Forward Speed Effects on Annular Jet Cushions

Published online by Cambridge University Press:  24 August 2017

A. J. Alexander*
Affiliation:
Department of Mechanical Engineering, University of Liverpool Now Department of Mechanical Engineering, University of Technology, Loughborough

Summary

Simple two-dimensional theory is extended to the case of a hovercraft having forward speed. It is shown that in general the effect of forward speed on lower surface lift is adverse but that the static pressure in the region of the rear jet has an important influence and if this pressure is low and hit is also low some reduction in lift power is achieved.

Type
Technical Notes
Copyright
Copyright © Royal Aeronautical Society 1968 

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. Symposium on Ground Effect Phenomena. Princeton University, October 1959.Google Scholar
2. Ehrich, F. E. The Curtain Jet. Journal Aero-Space Sciences, Vol. 28, No. 11, p. 855, November 1961.Google Scholar
3. Chang, P. K. Analytical Study of a Forward-Moving Annular Jet. Journal of the Franklin Institute, Vol. 274, p. 20, July 1962.Google Scholar
4. Harris, T. M., Davies, J. H. and Alexander, A. J. Some Tests on a Circular Ground Effect Machine with Forward Speed. College of Aeronautics, Cranfield, Note 133, October 1962.Google Scholar
5. Alexander, A. J., Ando, S., Thunholm, C. H. G., West, A. A. Separate papers in Proceedings of the Research Symposium on Air Cushion Craft. Dept. of Engineering, Swansea University, July 1964.Google Scholar
6. Walker, N. K. Some Notes on the Lift and Drag of Ground Effect Machines. IAS National Meeting on Hydrofoils and Air Cushion Vehicles, Washington, September 1962.Google Scholar
7. Geray, E. K. Effect of Ground Board Boundary Layer on Air Cushion Vehicle Wind Tunnel Tests. UTIAS TN 100, January 1967.Google Scholar
8. Strand, T., Royce, W. W. and Fujita, T. Cruise Performance of Channel Flow GEM's. Journal of Aero- Space Sciences, Vol. 29, pp. 702711, June 1962.Google Scholar
9. Alexander, A. J. The Momentum Equation for a Static Hovercraft at Zero Incidence. Journal of the Royal Aeronautical Society, Vol. 70, p. 363, February 1966.Google Scholar
10. Mair, W. A. The Physical Principles of Hovercraft. Journal of the Royal Aeronautical Society, Vol. 68, p. 683, October 1964.Google Scholar