#reaction-propulsion_engine__reaction_engine  a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream
  supertype:  engine  motor that converts thermal energy to mechanical work
  subtype:  ion_engine__ionengine  a type of reaction-propulsion engine to propel rockets in space; a stream of positive ions is accelerated to a high velocity by an electric field
  subtype:  jet_engine__jetengine  a gas turbine produces a stream of hot gas that propels a jet plane by reaction propulsion
     subtype:  ramjet_engine__ramjet__atherodyde__athodyd__flying_drainpipe  a simple type of jet engine; must be launched at high speed
     subtype:  rocket_engine__rocket  a jet engine containing its own propellant and driven by reaction propulsion
        subtype:  takeoff_booster__takeoffbooster__booster__booster_rocket__boosterrocket__booster_unit__boosterunit__multistage_rocket__takeoff_rocket__takeoffrocket  the first stage of a multistage rocket
        subtype:  nuclear_rocket__nuclearrocket  a rocket engine in which a nuclear reactor is used to heat a propellant
        subtype:  retrorocket  a small rocket engine on a larger rocket or spacecraft that is fired to slow or alter its course
        subtype:  space_rocket__spacerocket  a rocket powerful enough to travel into outer space
        subtype:  thruster  a small rocket engine that provides the thrust needed to maneuver a spacecraft
     subtype:  turbojet_engine__turbojet__turbofan__turbofan_engine  jet engine in which a turbine drives air to the burner

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