the bipropellant rocket engine with kerosene and gas-generator cycle is designed by who?
(AND spaceflight.rocket_engine_designer (JOIN spaceflight.rocket_engine_designer.rocket_engines (AND (JOIN (R spaceflight.rocket_engine_cycle.rocket_engines) m.04qqvv) (JOIN (R spaceflight.rocket_engine_fuel.rocket_engines) m.04bhf))))