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  • 1960-1964  (3)
  • 1
    Publication Date: 2019-05-21
    Description: Snap-50 powerplants for unmanned spacecraft propulsion
    Keywords: PROPELLANTS
    Type: AIAA PAPER-64-494
    Format: text
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  • 2
    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
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  • 3
    Publication Date: 2019-08-14
    Description: Mission performance capabilities of ion engines powered by the 30 kw and 60 kw SNAP-8 power supplies are compared for the following missions: a 24-hr equatorial satellite, a 100 n mi lunar satellite, a 500 n mi Mars satellite, a Mercury probe, and an out-of-the-ecliptic probe. The capabilities of arc- jet engines and chemical engines for the same missions are compared with those of the ion engines. The majority of the comparisons are for 8500-lb spacecraft which are boosted into a 300 n mi orbit by the Atlas-Centaur. Variations in initial orbit altitude, the use of actual launch dates rather than dates based on simplifying assumptions, and the combined use of chemical and electrical propulsion systems were also evaluated in terms of their effect on mission performance.
    Keywords: Spacecraft Propulsion and Power
    Type: R-2297-1 , HQ-E-DAA-TN21336
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