section_path: Engines/Lightning
section_name: Lightning
paragraph_text: Lightning
  
  Lightning is a vacuum-optimized engine designed for use on the upper stage of Firefly's Alpha rocket. Lightning produces 70.1 kilonewtons (15,800 lb) of thrust and a specific impulse of 322 seconds (3.16 km/s). Like Reaver, Lightning uses RP-1 and LOX as its propellants as well as the same combustion tap-off cycle. It is also re-lightable for missions requiring multiple upper stage burns. It uses Firefly's patented "Crossfire" injector design.