text: How do you power a rocket engine? | Knowasiak
  How do you power a rocket engine?
  April 30, 2022 · 27 min read
  I adore components, because they are magnificent.
  At this point, we have to introduce the term enthalpy. Enthalpy is the sum of all energy that a system contains. Specifically, enthalpy is the volume times the pressure plus its internal energy. The internal energy in this case consists of heat and kinetic energy. The higher the enthalpy in the system, the more potential it has to perform work.
  SpaceX' Falcon 1's upper stage with its Kestrel engineAstra's second stage Aether engineor the Space Shuttle's Orbital Maneuvering System (OMS) which used the AJ10-190 engine.
  the Merlin 1D engine on the Falcon 9 as just mentionedthe F-1 and J-2 engines used on the Saturn V rocketthe RD-107A and RD-108A engines on the Soyuz, also as previously mentionedand the RD-68 engine on the Delta IV Heavy.
  Today, Blue Origin utilizes the tap-off cycle on their BE-3 engine that powers their sub-orbital New Glenn rocket, and Firefly could be the first to reach orbit with their tap-off cycle Reaver and Lightning engines on their Alpha rocket.