Fig. 4. Altitude gained by the interorbital vehicle with a payload fraction of 0.58 as a function of elapsed time since initiating its journey from an altitude of 800 km above the Earth’s surface. Time for return iournev of the vehicle without navload is also shown. FIG. 5. Accumulative kilowatt hours of 60-cycle energy absorbed from source on Earth for each kilogram of payload as a function of elapsed time since the vehicle started its interorbital journey. Total energy consumed includes the return as well as the outward bound trip. Total cost of the energy is $452 at an energy cost of 5e per kilowatt hour.
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