Neon Navikea - typical dry cargo freighter designed to service colonies without extensive spacing infrastructure. The engine, as insane as it sounds, is a real though somewhat tenuous NASA proposal.
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https://ntrs.nasa.gov/citations/19930015551 https://ntrs.nasa.gov/citations/19920001892 https://doi.org/10.2514%2F3.29778 https://doi.org/10.2514%2F6.1991-3512