Scott Manley discusses some lunar base ideas. He posed the question that I thought up myself awhile back.
This is what you call a "good question". It seems that I had a conversation with the gas gun guy who responded to my query about how to get stuff off the moon, and he said that you wouldn't even have to heat hydrogen that hot in order to reach escape velocity.
So a hydrogen gas gun would be better than a rail gun. By the way, you could recover electricity by having some brakes to slow down the accelerator device. The way it would work is that you would need to heat up a chamber full of sealed hydrogen. It wouldn't have to be all that hot. The expansion of the gas would create the push needed to get the sled up to escape velocity. The hydrogen gas can be re-compressed and liquified for storage for the next shot.
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