It was powered by a reactor that used steam for propulsion. But I wonder if the following remake strategy would work: Though ballistic missile tech was used in movie, & NASA, the pursued wisdom in those years was wings, turbo, & ramjets, w/ rockets taking over @ around 4000mph & 35 miles up for the final push to orbit. They could draw from the future turbofan technology from the 747 plans, & design a subsonic plane that can carry an air-launched multistage missile=slung under the mothership's belly, powered at launch by afterburning turbojets to drive the missile horizontally to around mach 2, where the missile's ramjet system can propel the remaining package to about mach 7 or so at around 30 miles altitude. Because it's not going straight up, it wouldn't need enough thrust for a vertical launch, & as soon as the package sheds the ramjet stage, the final push to orbit can be done w/ a much smaller rocket package. I'm kind of bouncing this off my earlier post where I had a fictional Friendship 7 disaster shut down NASA. This could be the parallel of the V2 fiasco @ the opening scene of the original. Ironically, the "quick & dirty" ballistic missile pace to space was predominant both in the fictional private sector of the movie(more so in fact), & the government run NASA in real life. There was a quest b/4 going the missile route to fly into space. Maybe the team can conceal their project under the cover of aviation technology.
If you find yourself, it's probably a doppleganger
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