RS-68 Regen

Designer: Rocketdyne. Developed in: 2005. Propellants: Lox/LH2. Chambers: 1. Country: USA. Status: Design concept -2004.

Upgrade to basic RS-68 for Delta IV Heavy growth versions. Details not specificed, except that it would use a regeneratively-cooled expansion nozzle, presumably allowing it to run hotter, higher thrust and specific impulse.

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