This part is from Vulcan
cost:
10000
mass:
2.0
category:
Engine
TechRequired:
heavyRocketry
engine_data:
KS25
{"isp"=>{"vac"=>310.0, "atmo"=>285.0}, "propellant_ratios"=>{"LiquidFuel"=>0.9, "Oxidizer"=>1.1}, "max_thrust"=>750.0}