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02/H2/Al propulsion 02/H2/Al upper stage aluminum benefits of metallized Centaur combustion cryogenic propulsion cylindrical tankage design point Earth-orbital mission EFFICIENCIES AND INJECTED engine fixed stage flight Flyby/Uranus Probe UFUP fuel mass future upper stages Galileo mission Galileo-class mission geosynchronous orbit gravitational constant Increase in injected Inertial Upper Stage injected mass increase injection energy C3 Isp increase km/s km2/s2 Figure knr/s launch mass launch vehicle constraints lbrs/lbm LEO-GEO mission low Earth orbit metal loading metallized 02/H2/Al metallized propellants metallized system mission ref NASA nonmetallized counterparts NTO/MMH system NTO/MMH/Al stage NTO/MMH/Al system orbit transfer payload benefit payload capabilities payload delivery payload increases payoff C3 performance with 02/H2/Al plane change planetary missions potential propellant density Propulsion technology Figure reduced Saturn Orbiter/Titan Probe space-storable propellants spacecraft specific impulse efficiency stage can deliver STS and STS-C systems analyses TABLE Titan IV trajectory two-stage system two-stage vehicles upper-stage mission Uranus Flyby/Uranus Probe velocity change