This part is from Kerbolrise
cost:
650
mass:
0.5
category:
Propulsion
TechRequired:
experimentalAerodynamics
engine_data:
S1SRB
{"isp"=>{"vac"=>330.0, "atmo"=>160.0}, "propellant_ratios"=>{"LiquidFuel"=>0.9, "Oxidizer"=>1.1}, "max_thrust"=>50.0}

