We live in an era of renewed space exploration, where multiple agencies are planning to send astronauts to the Moon in the coming years.
Both systems have considerable advantages over conventional chemical propulsion, including a higher specific impulse rating, fuel efficiency, and virtually unlimited energy density.
The need for an electric power source, says Gosse, also raises the issue of heat rejection in space – where thermal energy conversion is 30-40 percent under ideal circumstances. This is why proposals that include both propulsion methods are favored, as they would combine the advantages of both. Gosse's proposal calls for a bimodal design based on a solid core NERVA reactor that would provide a specific impulse of 900 seconds, twice the current performance of chemical rockets.
When paired with an NTP engine, the WR would use pressure created by the reactor's heating of the LH2 fuel to compress the reaction mass further. As Gosse promises, this will deliver thrust levels comparable to that of a NERVA-class NTP concept but with an Isp of 1400-2000 seconds. When paired with a NEP cycle,"Coupled with an NEP cycle, the duty cycle Isp can further be increased with minimal addition of dry mass.
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