Raptor is the third full-flow staged combustion engine in history and the first such rocket engine to power a vehicle in flight.[18]
^Sierra Engineering & Software, Inc. (18 June 2019). "Exhaust Plume Calculations for SpaceX Raptor Booster Engine"(PDF). p. 1. Archived(PDF) from the original on 20 October 2021. Retrieved 17 September 2021. The nominal operating condition for the Raptor engine is an injector face stagnation pressure (Pc) of 3669.5 psia and a somewhat fuel-rich engine O/F mixture ratio (MR) of 3.60. The current analysis was performed for the 100% nominal engine operating pressure (Pc=3669.5 psia) and an engine MR of 3.60.
^Sierra Engineering & Software, Inc. (18 June 2019). "Exhaust Plume Calculations for SpaceX Raptor Booster Engine"(PDF). p. 1. Archived(PDF) from the original on 20 October 2021. Retrieved 17 September 2021. The subject engine uses a closed power cycle with a 34.34:1 regeneratively-cooled thrust chamber nozzle.
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^"Starship Users Guide, Revision 1.0, March 2020"(PDF). SpaceX/files. SpaceX. March 2020. Archived from the original(PDF) on 2 April 2020. Retrieved 18 May 2020. SpaceX's Starship system represents a fully reusable transportation system designed to service Earth orbit needs as well as missions to the Moon and Mars. This two-stage vehicle — composed of the Super Heavy rocket (booster) and Starship (spacecraft)