The Echo I Inflation System
National Aeronautics and Space Administration, 1964 - Artificial satellites - 53 pages
A study has been made to determine the feasibility and selection of a subliming organic compound for inflating the Echo I satellite in a circular orbit at an altitude of 1668 kilometers. Detailed investigations have been made with regard to temperature variations of the satellite while in the sunlight and shadow, the deforming loads present in the environment of space, the rate of hole growth due to micrometeoroid bombardment, a method of selecting the proper subliming compounds, as well as the pressure time history and mass flow rate of the subliming compound vapors out of the satellite. The agreement is good between the predicted performance of the inflation system and that inferred by published experimental data.
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1668 kilometers altitude angle anthraquinone approximately assumed atmospheric average benzoic acid calculated characteristics circular orbit coldspot consideration considered constant container continuous sunlight curve decrease deforming loads density determined direct distribution dynamic earth earth's shadow Echo I satellite energy enters environment equation equilibrium experimental expressed extrapolation factor figure folded gives greater heat hole incident increase indicates inflation system influx initial inside kilograms kilometers limited maintain mass flow rate material maximum meters method micrometeoroid organic packaged particles period plastic position powder predicted present pressure time history produced quantity range reached reference reflected relation remain result seen selected shape shown skin solar radiation solid sources space sphere spherical stress subliming compound sufficient sunlight surface taken temperature term thermal energy thermal response tion torr vapor pressure variation visual magnitude weight X X X