High Angle Of Attack Yawing Moment Asymmetry Of The X 31 Aircraft From Flight Test
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High Angle Of Attack Yawing Moment Asymmetry Of The X 31 Aircraft From Flight Test
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-05
High Angle Of Attack Yawing Moment Asymmetry Of The X 31 Aircraft From Flight Test written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-05 with categories.
Significant yawing moment asymmetries were encountered during the high-angle-of-attack envelope expansion of the two X-31 aircraft. These asymmetries led to position saturations of the thrust vector vanes and trailing-edge flaps during some of the dynamic stability axis rolling maneuvers at high angles of attack. This slowed the high-angle-of-attack envelope expansion and resulted in maneuver restrictions. Several aerodynamic modifications were made to the X-31 forebody with the goal of minimizing the asymmetry. A method for determining the yawing moment asymmetry from flight data was developed and an analysis of the various configuration changes completed. The baseline aircraft were found to have significant asymmetries above 45 deg angle of attack with the largest asymmetry typically occurring around 60 deg angle of attack. Applying symmetrical boundary layer transition strips along the forebody sides increased the magnitude of the asymmetry and widened the angle-of-attack range over which the largest asymmetry acted. Installing longitudinal forebody strakes and rounding the sharp nose of the aircraft caused the yawing moment asymmetry magnitude to be reduced. The transition strips and strakes made the asymmetry characteristic of the aircraft more repeatable than the clean forebody configuration. Although no geometric differences between the aircraft were known, ship 2 consistently had larger yawing moment asymmetries than ship 1. Cobleigh, Brent R. Unspecified Center RTOP 533-02-00...
High Angle Of Attack Yawing Moment Asymmetry Of The X 31 Aircraft From Flight Test
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Author :
language : en
Publisher:
Release Date : 1994
High Angle Of Attack Yawing Moment Asymmetry Of The X 31 Aircraft From Flight Test written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Comparison Of X 31 Flight And Ground Based Yawing Moment Asymmetries At High Angles Of Attack
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Author : Brent R. Cobleigh
language : en
Publisher:
Release Date : 2001
Comparison Of X 31 Flight And Ground Based Yawing Moment Asymmetries At High Angles Of Attack written by Brent R. Cobleigh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Angle of attack (Aerodynamics) categories.
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Author :
language : en
Publisher:
Release Date : 1966
written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1966 with categories.
Reynolds Number Effects At High Angles Of Attack
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Author : David F. Fisher
language : en
Publisher:
Release Date : 1998
Reynolds Number Effects At High Angles Of Attack written by David F. Fisher and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Airplanes, Military categories.
Lessons learned from comparision between ground-based tests and flight measurements for the high-angle-of-attack programs on the F-18 High Alpha Research Vehicle (HARV), the X-29 forward-swept wing aircraft, and the X-31 enhanced fighter maneuverability aircraft are presented. On all three vehicles, Reynolds number effects were evident on the forebodies at high angles of attack. The correlation between flight and wind tunnel forebody pressure distributions for the F-18 HARV were improved by using twin longitudinal grit strips on the forebody of the wind-tunnel model. Pressure distributions obtained on the X-29 wind-tunnel model at flight Reynolds numbers showed excellent correlation with the flight data up to [alpha]=50 deg. Above [alpha]=50 deg. the pressure distributions for both flight and wind tunnel became asymmetric and showed poorer agreement, possibly because of the different surface finish of the model and aircraft. The detrimental effect of a very sharp nose apex was demonstrated on the X-31 aircraft. Grit strips on the forebody of the X-31 reduced the randomness but increased the magnitude of the asymmetry. Nose strakes were required to reduce the forebody yawing moment asymmetries and the grit strips on the flight test noseboom improved the aircraft.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Nasa S Contributions To Aeronautics Aerodynamics Structures Propulsion Controls
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Author :
language : en
Publisher:
Release Date : 2010
Nasa S Contributions To Aeronautics Aerodynamics Structures Propulsion Controls written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Aeronautics categories.
Two-volume collection of case studies on aspects of NACA-NASA research by noted engineers, airmen, historians, museum curators, journalists, and independent scholars. Explores various aspects of how NACA-NASA research took aeronautics from the subsonic to the hypersonic era.-publisher description.
Monthly Catalogue United States Public Documents
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Author :
language : en
Publisher:
Release Date : 1995
Monthly Catalogue United States Public Documents written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Government publications categories.
Monthly Catalog Of United States Government Publications
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Author :
language : en
Publisher:
Release Date : 1995
Monthly Catalog Of United States Government Publications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Government publications categories.
Aeronautical Engineering A Cumulative Index To A Continuing Bibliography Supplement 325
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Author :
language : en
Publisher:
Release Date : 1995
Aeronautical Engineering A Cumulative Index To A Continuing Bibliography Supplement 325 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.