designing a bipropellant rocket engine with kerosene and staged combustion cycle describes what rocket engine designer?
(AND spaceflight.rocket_engine_designer (JOIN spaceflight.rocket_engine_designer.rocket_engines (AND (JOIN (R spaceflight.rocket_engine_cycle.rocket_engines) m.04qqmt) (JOIN (R spaceflight.rocket_engine_fuel.rocket_engines) m.04bhf))))