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A study of high-altitude manned research aircraft employing strut-braced wings of high-aspect-ratioThe effect of increased wing aspect ratio of subsonic aircraft on configurations with and without strut bracing. Results indicate that an optimum cantilever configuration, with a wing aspect ratio of approximately 26, has a 19% improvement in cruise range when compared to a baseline concept with a wing aspect ratio of approximately 10. An optimum strut braced configuration, with a wing aspect ratio of approximately 28, has a 31% improvment in cruise range when compared to the same baseline concept. This improvement is mainly due to the estimated reduction in wing weight resulting from use of lifting struts. All configurations assume the same mission payload and fuel. The drag characteristics of the wings are enhanced with the use of laminar flow airfoils. A method for determining the extent of attainable natural laminar flow, and methods for preliminary structural design and for aerodynamic analysis of wings lifting struts are presented.
Document ID
19810011539
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Smith, P. M.
(Kentron International, Inc. Hampton, VA, United States)
Deyoung, J.
(Kentron International, Inc. Hampton, VA, United States)
Lovell, W. A.
(Kentron International, Inc. Hampton, VA, United States)
Price, J. E.
(Kentron International, Inc. Hampton, VA, United States)
Washburn, G. F.
(Kentron International, Inc. Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1981
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
NASA-CR-159262
Report Number: NASA-CR-159262
Accession Number
81N20067
Funding Number(s)
CONTRACT_GRANT: NAS1-16000
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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