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Each version of the engine has a corresponding Raptor Vacuum (RVac) variant [78] with an extended, regeneratively-cooled nozzle for higher specific impulse in space. The vacuum-optimized Raptor targets a specific impulse of ≈380 s (3,700 m/s). [8] A full-duration test of version 1 of Raptor Vacuum was completed in September 2020 at McGregor. [78]
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The booster would utilize multiple Raptor engines, similar to the use of nine Merlin 1s on each Falcon 9 booster core. [17] The following month, SpaceX confirmed that as of March 2014, all Raptor development work is exclusively on this single very large rocket engine, and that no smaller Raptor engines were in the current development mix. [14]
SpaceX CEO celebrated the first test firing of a full-scale, built-for-flight Raptor engine for his Starship super-rocket in the usual way tonight: by tweeting about it. "So proud of great work by ...
Engine Origin Designer Vehicle Status Use Propellant Power cycle Specific impulse (s) [a] Thrust (N) [a] Chamber pressure (bar) Mass (kg) Thrust: weight ratio [b] Oxidiser: fuel ratio
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The Raptor engine uses a full-flow staged combustion cycle with oxygen and methane-rich turbopumps. [27] [28] Before 2014, only two full-flow staged-combustion rocket engine designs had advanced enough to undergo testing: the Soviet RD-270 project in the 1960s and the Aerojet Rocketdyne Integrated Powerhead Demonstrator in the mid-2000s. [29]
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