A liquid oxygen/liquid methane engine under development for Nasa's Project Morpheus. This 4000lb-force engine was designed, built, and tested by Armadillo Aerospace. It's a pressure-fed engine with a pintle injector of particularly low pressure drop, with replaceable injector elements for tuning mixing behavior.
Methane could be obtained in situ from the Martian atmosphere via the Sabatier reaction, CO2 + 4H2 → CH4 + 2H2O.
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