This part is from USI Kolonization Systems (MKS/OKS)
cost:
1750
mass:
1.25
category:
Propulsion
TechRequired:
heavyRocketry
engine_data:
KS25
{"isp"=>{"vac"=>240.0, "atmo"=>280.0}, "propellant_ratios"=>{"LiquidFuel"=>0.9, "Oxidizer"=>1.1}, "max_thrust"=>320.0}