liquid rocket engine produced by the US to use a hydrocarbon fuel. In contrast, the Soviet Union developed the RD-170 reusable staged combustion hydrocarbon engine for the Energia rocket in the 1980s.

The prototype engine would have 4732 kN at sea level; 5026 kN in vacuum; an 8-shift turn time; a specific impulse of 305 at sea level and 324 in vacuum.

NASA cancelled further development in 2005.

TR-106 / TR-107 rocket engines

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