Quote:
https://ntrs.nasa.gov › citations › 19870000360
Coal-Fired Rocket Engine - NASA Technical Reports Server (NTRS)
Coal-Fired Rocket Engine Brief report describes concept for coal-burning hybrid rocket engine. Proposed engine carries larger payload, burns more cleanly, and safer to manufacture and handle than conventional solid-propellant rockets. Thrust changeable in flight, and stops and starts on demand. Document ID 19870000360 Document Type
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Else you can turn the coal into kerosene and burn it with liquid Oxygen:
Is China's New Rocket Really Coal Powered? Deep Space Updates - April 2nd -- Scott Manley
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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