This part is from Far Future Technologies
cost:
98000
mass:
6.25
category:
Engine
TechRequired:
nuclearPropulsion
engine_data:
standard
{"isp"=>{"vac"=>1025.0, "atmo"=>850.0}, "propellant_ratios"=>{"LqdHydrogen"=>64.0, "MtlHydrogen"=>1.0}, "max_thrust"=>950.0}