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a-priori t1_ixzhulv wrote

Another one are plasma jets, which use microwaves to turn compressed gasses into plasma and extract thrust from that. These can be air breathing in the atmosphere and use stored gasses in vacuum.

There’s a prototype microwave plasma jet that’s proposed as an alternative for airplanes because it has similar power density (factoring in battery weight) to turbojets.

https://aip.scitation.org/doi/10.1063/5.0005814

If you could power these by beamed power, and switch from air breathing to stored gasses when in a vacuum, then it could be a viable lifting engine.

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