This part is from Stockalike Realism Overhaul
cost:
3800
mass:
4.0
category:
Propulsion
TechRequired:
advRocketry
engine_data:
F1
{"isp"=>{"vac"=>430.0, "atmo"=>370.0}, "propellant_ratios"=>{"Kerosene"=>0.9, "LiquidOx"=>1.1}, "max_thrust"=>1500.0}