def make_two_stage_rocket(temperature, ox_mass, ox_volume=None): panthera = make_panthera(temperature, 3.5, ox_tank_volume=None, ox_mass=ox_mass) panthera.load_drag_data(1) #panthera.engine.construct_injector(panthera.oxidiser.pressure, panthera.oxidiser.temperature, panthera.fuel.pressure, panthera.fuel.temperature) pro98 = SolidMotor("Pro98", "white-dwarf") pro98.read_eng_file() aluminium = Material(2700, 270e6) condor = Rocket(None, None, aluminium, pro98, 15, 0.1) condor.load_drag_data(2) rocket = { "booster": panthera, "booster-sep": False, "delay": 1.0, "sustainer": condor } return (rocket)