#rotary_engine  an internal-combustion engine in which power is transmitted directly to rotating components
  supertype:  #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:  #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

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