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  • Other Sources  (2)
  • 2005-2009
  • 2000-2004
  • 1985-1989  (2)
  • 1970-1974
  • 1989  (2)
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  • 2005-2009
  • 2000-2004
  • 1985-1989  (2)
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  • 1
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    Unknown
    Longitudinal stability and control characteristics of the Quiet Short-Haul Research Aircraft (QSRA) (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Flight experiments were conducted to evaluate various aerodynamic characteristics of the Quiet Short-Haul Research Aircraft (QSRA), an experimental aircraft that makes use of the upper-surface blown (USB) powered-lift concept. Time-history records from maneuvers performed with the aircraft in landing-approach and take-off configurations (with its stability augmentation system disengaged) were analyzed to obtain longitudinal stability and control derivatives and performance characteristics. The experiments included measuring the aircraft responses to variations in the deflection of direct-lift control spoilers and to thrust variations as well as to elevator inputs. The majority of the results are given for the aircraft in a landing configuration with the USB flaps at 50 degrees. For this configuration, if the static longitudinal stability is defined as the variation of the pitching-moment coefficient with the lift coefficient at a constant thrust coefficient, this stability decreases significantly with increasing angle of attack above 9 degrees. For this configuration, at small and negative angles of attack and high levels of thrust, the elevators and the horizontal stabilizer lost effectiveness owing to incipent stalling, but this occurred only during unsteady maneuvers and for brief time intervals.
    Keywords: AIRCRAFT STABILITY AND CONTROL
    Type: NASA-TP-2965 , A-89133 , NAS 1.60:2965
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Rebuilding the space technology base (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: NASA's Civil Space Technology Initiative (CSTI) will not only develop novel technologies for space exploration and exploitation, but also take mature technologies into their demonstration phase in earth orbit. In the course of five years, CSTI will pay off in ground- and space-tested hardware, software, processes, methods for low-orbit transport and operation, and fundamental scientific research on the orbital environment. Attention is given to LOX/hydrogen and LOX/hydrocarbon reusable engines, liquid/solid fuel hybrid boosters, and aeroassist flight experiments for the validation of aerobraking with atmospheric friction. Also discussed are advanced scientific sensors, systems autonomy and telerobotics, control of flexible structures, precise segmented reflectors, high-rate high-capacity data handling, and advanced nuclear power systems.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Aerospace America (ISSN 0740-722X); 27; 28-33
    Format: text
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    NASA TECHNICAL REPORTS
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