#heat_engine  any engine that makes use of heat to do work
  supertype:  engine  motor that converts thermal energy to mechanical 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

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