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Merlin
| Merlin 1A SpaceX LOx/Kerosene rocket engine. First stages. Hardware. Completed development in early 2005. Pintle injector concept. Replaced by Merlin 1C. First flight 2006. |
| Merlin 1C SpaceX LOx/Kerosene rocket engine. First stages. Hardware. Regeneratively cooled; turbo-pump also provided high pressure kerosene for the hydraulic actuators. Actuated turbine exhaust nozzle provided roll control. First flight 2008. |
| Merlin 1Cvac SpaceX LOx/Kerosene rocket engine. Hardware. Upper stage version of the Merlin developed for the Falcon 9 second stage. Based on the Merlin 1C and using a regeneratively cooled combustion chamber. First flight 2009. |
| Merlin 1D SpaceX LOx/Kerosene rocket engine. Hardware. First stage version of the Merlin developed for the Falcon 9.1. Based on the Merlin 1C and using a regeneratively cooled combustion chamber. First flight 2014. |
| Merlin 1Dvac SpaceX LOx/Kerosene rocket engine. Hardware. Version of the Merlin 1D for upper stage use, with an expansion nozzle greater than 117 resulting in a specific impulse said to be 340 seconds but probably even greater based on the vehicle performance. |
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