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added payload advanced propulsion aerobrake aerocapture aeroshell aluminum loading chemical propulsion crew module cryogenic propulsion delivered to Mars descent Earth orbit insertion engine efficiencies evolution and expedition Expansion ratio Exploration of Mars fuel mass Increasing propellant density increasing the payload initial mass km/s lbf-s/lbm leg structure leo mass penalty leo mass saving low Earth orbit maneuvers Mars base Mars excursion vehicle Mars orbit insertion Mars surface Mars transfer vehicle Mars vehicle mass in leo mass required maximal operating pressure metal loading metallized propellant combinations missions the leo Mixture ratio monomethyl hydrazine NASA NTO/MMH payload delivered percent more payload personal communication piloted vehicle Preinjection preparation propellant mass propellant tank volume propulsion system dry psia reduction in launch Residuals and holdup return propellant return to leo Scaling parameter second stage split sprint mission storable sts-c launches system dry mass system mass-scaling parameters tankage Thermal control total mass trans-Mars injection stage Velocity change