This part is from UTech Nuclear Science Ink.
cost:
33100
mass:
7.2
category:
Engine
TechRequired:
heavyRocketry
engine_data:
standard
{"isp"=>{"vac"=>18900.0, "atmo"=>0.0}, "propellant_ratios"=>{"name =HydrogenFuel"=>3.0, "Boron11Fuel"=>1.0}, "max_thrust"=>2300.0}