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  • 1970-1974  (7)
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  • 1
    Publication Date: 2019-06-27
    Description: An experimental investigation was conducted to determine the effects of several variations in body shape on the aerodynamic characteristics of an all-body hypersonic aircraft configuration. The basic configuration had a delta planform with an elliptic cone forebody and an afterbody of elliptic cross section terminating in a straight-line trailing edge. Variations in body shape included the ratio of maximum cross-sectional to body planform area, body leading-edge sweep, and forebody length ratio. In addition, the effects of a thin wing mounted on one of the bodies was investigated, and the aerodynamic characteristics of just the forebodies of two of the configurations were determined. The models had no stabilizing surfaces or propulsion system packages. Ranges of angle of attack (-4 deg to +15 deg) and angle of sideslip (-4 deg to +8 deg) were investigated. Of the four complete bodies, the configuration with the lowest ratio of cross-sectional to body planform area had the highest maximum lift-drag ratio and the greatest level of longitudinal stability at most Mach numbers. All the configurations had positive longitudinal stability near maximum lift-drag ratio at most Mach numbers. With exception of the lowest subsonic Mach numbers, changes in body sweep angle and in forebody length ratio had only minor effects on maximum lift-drag ratio.
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-6821 , A-4297
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-27
    Description: A computerized synthesis program has been used to assess the effects of various vehicle and mission parameters on the performance of a highly maneuverable remotely piloted vehicle (RPV) for the air-to-air combat role. The configuration used in the study is a trapezoidal-wing and body concept, with forward-mounted stabilizing and control surfaces. The study mission consists of an outbound cruise, an acceleration phase, a series of subsonic and supersonic turns, and a return cruise. Performance is evaluated in terms of both the required vehicle weight to accomplish this mission and combat effectiveness as measured by turning and acceleration capability. The report describes the synthesis program, the mission, the vehicle, and the results of sensitivity and trade studies.
    Keywords: AIRCRAFT
    Type: NASA-TN-D-7551 , A-5157
    Format: application/pdf
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  • 3
    Publication Date: 2019-06-27
    Description: Aerodynamic characteristics of a model designed to represent an all body, hypersonic cruise aircraft are presented for Mach numbers from 0.65 to 10.6. The configuration had a delta planform with an elliptic cone forebody and an afterbody of elliptic cross section. Detailed effects of varying angle of attack (-2 to +15 deg), angle of sideslip (-2 to +8 deg), Mach number, and configuration buildup were considered. In addition, the effectiveness of horizontal tail, vertical tail, and canard stabilizing and control surfaces was investigated. The results indicate that all configurations were longitudinally stable near maximum lift drag ratio. The configurations with vertical tails were directionally stable at all angles of attack. Trim penalties were small at hypersonic speeds for a center of gravity location representative of the airplane, but because of the large rearward travel of the aerodynamic center, trim penalties were severe at transonic Mach numbers.
    Keywords: AIRCRAFT
    Type: NASA-TN-D-6577 , A-4017
    Format: application/pdf
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  • 4
    Publication Date: 2019-06-27
    Description: A computerized aircraft synthesis program has been used to assess the effects of various vehicle and mission parameters on the performance of an oblique, all-wing, remotely piloted vehicle (RPV) for the highly maneuverable, air-to-air combat role. The study mission consists of an outbound cruise, an acceleration phase, a series of subsonic and supersonic turns, and a return cruise. The results are presented in terms of both the required vehicle weight to accomplish this mission and the combat effectiveness as measured by turning and acceleration capability. This report describes the synthesis program, the mission, the vehicle, and results from sensitivity studies. An optimization process has been used to establish the nominal RPV configuration of the oblique, all-wing concept for the specified mission. In comparison to a previously studied conventional wing-body canard design for the same mission, this oblique, all-wing nominal vehicle is lighter in weight and has higher performance.
    Keywords: AIRCRAFT
    Type: NASA-TN-D-7731 , A-5338
    Format: application/pdf
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  • 5
    Publication Date: 2019-06-27
    Description: Flight constraints and aerodynamic characteristics of hypersonic research aircraft
    Keywords: AIRCRAFT
    Type: NASA-TM-X-2222 , A-3567
    Format: application/pdf
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  • 6
    Publication Date: 2019-06-27
    Description: Wing elevation, incidence, and chamber effects on aerodynamic characteristics of representative hypersonic cruise configuration at Mach numbers from 0.65 to 10.70
    Keywords: AERODYNAMICS
    Type: NASA-TN-D-6049 , A-3701
    Format: application/pdf
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  • 7
    Publication Date: 2019-06-27
    Description: Longitudinal aerodynamic stability of three hypersonic aircraft at Mach numbers from 0.065 to 10.70
    Keywords: AERODYNAMICS
    Type: NASA-TM-X-2113
    Format: application/pdf
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