Preliminary Flight-Determined Subsonic Lift and Drag Characteristics of the X-29a Forward-Swept-Wing Airplane

Preliminary Flight-Determined Subsonic Lift and Drag Characteristics of the X-29a Forward-Swept-Wing Airplane
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 48
Release: 2018-07-10
Genre:
ISBN: 9781722499822

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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...

Flight Dynamics

Flight Dynamics
Author: Robert F. Stengel
Publisher: Princeton University Press
Total Pages: 864
Release: 2015-01-27
Genre: Science
ISBN: 1400866812

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Flight Dynamics takes a new approach to the science and mathematics of aircraft flight, unifying principles of aeronautics with contemporary systems analysis. While presenting traditional material that is critical to understanding aircraft motions, it does so in the context of modern computational tools and multivariable methods. Robert Stengel devotes particular attention to models and techniques that are appropriate for analysis, simulation, evaluation of flying qualities, and control system design. He establishes bridges to classical analysis and results, and explores new territory that was treated only inferentially in earlier books. This book combines a highly accessible style of presentation with contents that will appeal to graduate students and to professionals already familiar with basic flight dynamics. Dynamic analysis has changed dramatically in recent decades, with the introduction of powerful personal computers and scientific programming languages. Analysis programs have become so pervasive that it can be assumed that all students and practicing engineers working on aircraft flight dynamics have access to them. Therefore, this book presents the principles, derivations, and equations of flight dynamics with frequent reference to MATLAB functions and examples. By using common notation and not assuming a strong background in aeronautics, Flight Dynamics will engage a wide variety of readers. Introductions to aerodynamics, propulsion, structures, flying qualities, flight control, and the atmospheric and gravitational environment accompany the development of the aircraft's dynamic equations.

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author:
Publisher:
Total Pages: 456
Release: 1995
Genre: Aeronautics
ISBN:

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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.

Preliminary Flight-Determined Subsonic Lift and Drag Characteristics of the X-29a Forward-Swept-Wing Airplane

Preliminary Flight-Determined Subsonic Lift and Drag Characteristics of the X-29a Forward-Swept-Wing Airplane
Author: National Aeronautics and Space Adm Nasa
Publisher: Independently Published
Total Pages: 50
Release: 2018-10-25
Genre:
ISBN: 9781729234532

Download Preliminary Flight-Determined Subsonic Lift and Drag Characteristics of the X-29a Forward-Swept-Wing Airplane Book in PDF, Epub and Kindle

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...