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The design challenge of high altitude long endurance (Hale) unmanned aircraft

Published online by Cambridge University Press:  04 July 2016

R. I. Jones
R. I. Jones*
Affiliation:
College of AeronauticsCranfield University, Cranfield, UK
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Abstract

The requirement for an aircraft to operate in the thin atmosphere at high altitudes for long periods provides a particular challenge to all areas of aeronautical engineering. This is reflected in a range of difficulties encountered when attempting to design aircraft for this type of operation.

This paper first considers the reasons for adopting an unmanned solution for high altitude long endurance (Hale) aircraft. It then indicates how the demands of Hale operations lead to problems in applying the design approach taken for more common aircraft types. Some of the work performed at the College of Aeronautics (CoA), in attempting to address the problem areas for the design process and produce initial designs for a range of Hale unmanned aircraft (UMA) types, is then reviewed. The lack of data/methods to allow the prediction of Hale UMA structure mass, engine performance at high altitudes and aerodynamic parameters for low Reynolds number operation and high aspect ratio configurations are identified as particular problems. However, initial design, based on standard approaches, has been shown to be possible, provided caution is exercised.

Type
Research Article
Information
The Aeronautical Journal , Volume 103 , Issue 1024 , June 1999 , pp. 273 - 280
Copyright
Copyright © Royal Aeronautical Society 1999 

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References

1. Loftin, L.K. Subsonic aircraft: evolution and matching of size to performance, NASA RP-1060, August 1980.Google Scholar
2. Torenbeek, E. Synthesis of Subsonic Airplane Design, Delft University Press, 1981.Google Scholar
3. Roskam, J. Airplane Design, Part 1: Preliminary Sizing of Airplanes, Roskam Aviation and Engineering Corporation, 1989.Google Scholar
4. Anon. Caption below photograph of Teledyne Ryan Global Hawk, Aerospace International, March 1999, 26, (3), p 9.Google Scholar
5. Fulghum, D.A. Will new elusive craft rise from DarkStar?, AW&ST, 22 February 1999, 150, 7, pp 27–28.Google Scholar
6. Raynumarn, B. Comparison of Methods for Predicting Aerodynamic Parameters for High Aspect Ratio Configurations, Cranfield University MSc thesis, 1998.Google Scholar
7. Render, P.M. The Experimental and Theoretical Aerodynamic Characteristics of Aerofoil Sections Suitable for Remotely Piloted Vehicles, Cranfield Institute of Technology PhD thesis, 1984.Google Scholar
8. Picard, P.-H. High Altitude Long Endurance Unmanned Aircraft: Composite Wing Design, Cranfield Institute of Technology MSc thesis, August 1993.Google Scholar
9. Bizzarri, D.L.G. High Altitude, Long Endurance, Unmanned Aircraft, Propulsion System, Cranfield Institute of Technology MSc thesis, August 1993.Google Scholar
10. Chang, J.M. A Flexible, Subsonic High Altitude Long Endurance UAV Conceptual Design Methodology, Cranfield University PhD thesis, 1997.Google Scholar
11. Young, G.D. Conceptual Design of a High-Altitude Long-Endurance RPV, Cranfield Institute of Technology MSc thesis, September 1992.Google Scholar
12. Chudoba, B. Conceptual Design of a Solar Rechargeable High Altitude Tailless Aircraft, Cranfield University MSc thesis, August 1995.Google Scholar
13. Loose, L. Optimisation of the Endurance and Range Performance for a Hale Aircraft, Cranfield University MSc thesis, September 1996.Google Scholar
14. Altman, A. Design methodology for low speed high altitude long endurance unmanned aerial vehicles, 21st Congress of the International Council of the Aeronautical Sciences, Melbourne, Australia, 13-18 Sept 1998.Google Scholar