This part is from SpaceX Launch Vehicles - Real Size
cost:
200
mass:
0.1
category:
Propulsion
TechRequired:
advRocketry
engine_data:
KSX
{"isp"=>{"vac"=>315.0, "atmo"=>260.0}, "propellant_ratios"=>{"LiquidFuel"=>0.9, "Oxidizer"=>1.1}, "max_thrust"=>50.0}