Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722499822
Category :
Languages : en
Pages : 48
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The X-29A subsonic lift and drag characteristics determined, met, or exceeded predictions, particularly with respect to the drag polar shapes. Induced drag levels were as great as 20 percent less than wind tunnel estimates, particularly at coefficients of lift above 0.8. Drag polar shape comparisons with other modern fighter aircraft showed the X-29A to have a better overall aircraft aerodynamic Oswald efficiency factor for the same aspect ratio. Two significant problems arose in the data reduction and analysis process. These included uncertainties in angle of attack upwash calibration and effects of maneuver dynamics on drag levels. The latter problem resulted from significantly improper control surface automatic camber control scheduling. Supersonic drag polar results were not obtained during this phase because of a lack of engine instrumentation to measure afterburner fuel flow. Hicks, John W. and Huckabine, Thomas Armstrong Flight Research Center RTOP 533-02-51...
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
ISBN: 9781729234532
Category :
Languages : en
Pages : 50
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Book Description
The X-29A subsonic lift and drag characteristics determined, met, or exceeded predictions, particularly with respect to the drag polar shapes. Induced drag levels were as great as 20 percent less than wind tunnel estimates, particularly at coefficients of lift above 0.8. Drag polar shape comparisons with other modern fighter aircraft showed the X-29A to have a better overall aircraft aerodynamic Oswald efficiency factor for the same aspect ratio. Two significant problems arose in the data reduction and analysis process. These included uncertainties in angle of attack upwash calibration and effects of maneuver dynamics on drag levels. The latter problem resulted from significantly improper control surface automatic camber control scheduling. Supersonic drag polar results were not obtained during this phase because of a lack of engine instrumentation to measure afterburner fuel flow. Hicks, John W. and Huckabine, Thomas Armstrong Flight Research Center RTOP 533-02-51...
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Category :
Languages : en
Pages : 48
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Category : Aeronautics
Languages : en
Pages : 456
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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Category :
Languages : en
Pages : 66
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Category : Government publications
Languages : en
Pages : 794
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Category : Government publications
Languages : en
Pages : 1384
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Languages : en
Pages : 648
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Category : Aeronautics
Languages : en
Pages : 538
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Category : Aeronautics
Languages : en
Pages : 654
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