A liquid rocket engine powerhead (or powerpack) is the collective term for the section of a rocket engine consisting of turbopumps, preburners / gas generators, and all the requisite equipment for a non-pressure-fed engine cycle, minus the combustion chamber and the expansion nozzle.
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This article is an automated import of the Wikipedia article "Powerhead (rocket engine)", available at https://en.wikipedia.org/wiki/Powerhead_(rocket_engine) . Text is licensed under CC BY-SA 4.0.