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Old 04-03-2023, 07:08 PM   #54 (permalink)
freebeard
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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
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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