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  • 1
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    Unknown
    In:  Other Sources
    Publication Date: 2019-05-30
    Description: Linear theory of optimum variable thrust rendezvous trajectories with power limit propulsion system
    Keywords: SPACE SCIENCES
    Format: text
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  • 2
    Publication Date: 2019-05-30
    Description: Minimum impulse time free transfer between elliptic orbits
    Keywords: SPACE SCIENCES
    Type: NASA-CR-636
    Format: application/pdf
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  • 3
    Publication Date: 2019-05-24
    Description: Optimal variable thrust rendezvous of power limited rocket between neighboring low eccentricity orbits
    Keywords: SPACE SCIENCES
    Type: C-910098-12
    Format: text
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  • 4
    Publication Date: 2019-06-27
    Description: A study has been performed to evaluate the opportunities for reducing the energy requirements of the U.S. domestic air passenger transport system through improved operational techniques, modified in-service aircraft, derivatives of current production models, or new aircraft using either current or advanced technology. Each of the fuel-conserving alternatives has been investigated individually to test its potential for fuel conservation relative to a hypothetical baseline case in which current, in-production aircraft types are assumed to operate, without modification and with current operational techniques, into the future out to the year 2000.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-138877 , UTRC-R76-912036-16
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  • 5
    Publication Date: 2019-06-27
    Description: The RECAT study evaluated the opportunities for reducing the energy requirements of the U.S. domestic air passenger transport system through improved operational techniques, modified in-service aircraft, derivatives of current production models, or new aircraft using either current or advanced technology. Each of these fuel-conserving alternatives was investigated individually to test its potential for fuel conservation relative to a hypothetical baseline case in which current, in-production aircraft types are assumed to operate, without modification and with current operational techniques, into the future out to the year 2000. Consequently, while the RECAT results lend insight into the directions in which technology can best be pursued for improved air transport fuel economy, no single option studied in the RECAT program is indicative of a realistic future scenario.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: NASA-CR-137878 , UTRC-R76-912036-17
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  • 6
    Publication Date: 2019-07-13
    Description: Four representative market scenarios were studied to evaluate the relative performance of air-and surface-based transportation systems in meeting the needs of two developing contries, Brazil and Indonesia, which were selected for detailed case studies. The market scenarios were: remote mining, low-density transport, tropical forestry, and large cargo aircraft serving processing centers in resource-rich, remote areas. The long-term potential of various aircraft types, together with fleet requirements and necessary technology advances, is determined for each application.
    Keywords: URBAN TECHNOLOGY AND TRANSPORTATION
    Type: NASA-CR-145343 , R78-912839-14
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  • 7
    Publication Date: 2019-07-13
    Description: The study on which this paper is based, known as RECAT (Study of Cost Benefit Tradeoffs for Reducing the Energy Consumption of the Commercial Air Transportation System), was sponsored by NASA to establish a basis for assigning priorities in its aircraft fuel-conservation R&D program. The study involved coordinated efforts by four independent contractors to conceive and quantify fuel-conserving technology alternatives, transform these alternatives into viable R&D options, and simulate each option in a general model of the U.S. domestic air transportation system. This paper deals primarily with the latter phase and concentrates on the results of the study, as revealed not only by estimated fuel usage but also by other impacts of the technology options, such as demand growth, operator economics, and fleet composition. However, while the paper focuses on results, the basic assumptions and technology inputs are documented, and a general description of the modeling approach is provided to demonstrate the level of detail considered in the analysis.
    Keywords: AIR TRANSPORTATION AND SAFETY
    Type: Annual Intersociety Conference on Transportation; Jul 18, 1976 - Jul 23, 1976; Los Angeles, CA
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  • 8
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    In:  Other Sources
    Publication Date: 2019-06-27
    Description: Impulsive trajectories optimal and nonoptimal solutions, classifying known results for reference purposes
    Keywords: SPACE SCIENCES
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  • 9
    Publication Date: 2019-06-27
    Description: Literature survey of astrodynamics problems on intercept, transfer, and rendezvous trajectories
    Keywords: SPACE SCIENCES
    Type: NASA-CR-61999 , G-910557-11
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  • 10
    Publication Date: 2019-08-14
    Description: Payloads and mission times were calculated for space vehicles propelled by ion rockets using nuclear power supplies having specific weights from 10 t o 50 lb/kw. Included in the study were five missions: low-altitude lunar satellite, low-altitude Venus satellite, solar probe, Saturn probe, and a Jupiter satellite with a circular orbit at the altitude of Jupiter's fourth moon. The variation of payload with the ration of power supply weight to gross weight was studied and the optimum power levels thereby determined. The ion rocket payload capabilities were compared with those of high-thrust vehicles using hydrogen-oxygen rockets and tungsten-core nuclear rockets; in addition the performance of high- and low-thrust systems staged in combination has been investigated. Launch vehicles considered in this study were the Atlas-Centaur, the Saturn C-1, and the Saturn C-5.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: R-1297-9 , HQ-E-DAA-TN45375
    Format: application/pdf
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