#engine  motor that converts thermal energy to mechanical work
  supertype:  motor  machine that converts other forms of energy into mechanical energy and so imparts motion
  part:  camshaft  gearing
  subtype:  aircraft_engine  the engine that powers and aircraft
  subtype:  automobile_engine  the engine that propels an automobile
  subtype:  auxiliary_engine__auxiliaryengine__donkey_engine  a small engine (as one used on board ships to operate a windlass)
  subtype:  generator  engine that converts mechanical energy into electrical energy by electromagnetic induction
     subtype:  alternator  an old term for an electric generator that produces alternating current (especially in automobiles)
     subtype:  dynamo  generator consisting of a coil (the armature) that rotates between the poles of an electromagnet (the field magnet) causing a current to flow in the armature
     subtype:  magneto__magnetoelectric_machine__magnetoelectricmachine  a small dynamo with a secondary winding that produces a high voltage enabling a spark to jump between the poles of a spark plug in a gasoline engine
     subtype:  turbogenerator  generator consisting of a steam turbine coupled to an electric generator for the production of electric power
     subtype:  aerogenerator__windmill__wind_generator  generator that extracts usable energy from winds
  subtype:  heat_engine  any engine that makes use of heat to do work
     subtype:  external-combustion_engine  a heat engine in which ignition occurs outside the chamber (cylinder or turbine) in which heat is converted to mechanical energy
        subtype:  steam_engine__steamengine  external-combustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder
     subtype:  internal-combustion_engine__ICE  a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine
        subtype:  diesel_engine__diesel__diesel_motor  an internal-combustion engine that burns heavy oil
        subtype:  four-stroke_engine__four-stroke_internal-combustion_engine  an internal-combustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke; work is done on the third stroke and the products of combustion are exhausted on the fourth stroke
        subtype:  gas_engine__gasengine  an internal-combustion engine similar to a gasoline engine but using natural gas instead of gasoline vapor
        subtype:  gasoline_engine  an internal-combustion engine that burns gasoline; most automobiles are driven by gasoline engines
           subtype:  put-put__putput  (informal) a small gasoline engine (as on motor boat)
        subtype:  outboard_motor__outboard  internal-combustion engine that mounts at stern of small boat
        subtype:  radial_engine__rotary_engine  an internal-combustion engine having cylinders arranged radially around a central crankcase
        subtype:  reciprocating_engine__reciprocatingengine  an internal-combustion engine in which the crankshaft is turned by pistons moving up and down in cylinders
        subtype:  rotary_engine  an internal-combustion engine in which power is transmitted directly to rotating components
           subtype:  turbine  rotary engine in which the kinetic energy of a moving fluid is converted into mechanical energy by causing a bladed rotor to rotate
              subtype:  gas_turbine__gasturbine  turbine that converts the chemical energy of a liquid fuel into mechanical energy by internal combustion; gaseous products of the fuel (which is burned in compressed air) are expanded through a turbine
              subtype:  hydroelectric_turbine__hydroelectricturbine  turbine consisting of a large and efficient version of a water wheel used to drive an electric generator
                 subtype:  Francis_turbine  a type of hydroelectric turbine
              subtype:  impulse_turbine__impulseturbine  a turbine that is driven by jets direct against the blades
              subtype:  reaction_turbine  a turbine with blades arranged to develop torque from gradual decrease of steam pressure from inlet to exhaust
              subtype:  steam_turbine__steamturbine  turbine in which steam strikes blades and makes them turn
           subtype:  Wankel_engine__Wankel_rotary_engine__epitrochoidal_engine__epitrochoidalengine  a rotary engine that is a four-stroke internal-combustion engine without reciprocating parts
        subtype:  valve-in-head_engine  internal-combustion engine having both inlet and exhaust valves located in the cylinder head
  subtype:  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
     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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