#rotating_mechanism  a mechanism that rotates
  supertype:  mechanism  device consisting of a piece of machinery; has moving parts that perform some function
  part:  bearing  rotating_shaft
  subtype:  blade.rotating_mechanism__vane  flat surface that rotates and pushes against air or water
     subtype:  fan_blade__fanblade  blade of a rotating fan
     subtype:  impeller  the blade of a rotor (as in the compressor of a jet engine)
     subtype:  paddle.blade  a blade of a paddle wheel or water wheel
     subtype:  rudder_blade  the vertical blade on a rudder
  subtype:  cam  a rotating disk shaped to convert circular into linear motion
     subtype:  distributor_cam__distributorcam  the cam inside the distributor that rotates to contact spark plug terminals in the correct order
  subtype:  circle.rotating_mechanism__round  any circular or rotating mechanism; "the machine punched out metal circles"
     subtype:  disk__disc  a thin flat circular plate
        subtype:  acetate_disk__acetatedisk__phonograph_recording_disk  a disk coated with cellulose acetate
        subtype:  brake_disk__brakedisk  the brake disk plate is fixed to the wheel; pressure is applied to it by the brake pads
        subtype:  diaphragm  electro-acoustic transducer that vibrates to receive or produce sound waves
        subtype:  discus.disk__saucer  a disk used in throwing competitions
        subtype:  Frisbee  (trademark) a light plastic disk about 10 inches in diameter; sailed with a flip of the wrist for recreation or competition
        subtype:  planchet__coin_blank  a flat metal disk ready for stamping as a coin
        subtype:  hockey_puck__puck  a vulcanized rubber disk 3 inches in diameter that is used instead of a ball in ice hockey
        subtype:  token  a metal or plastic disk that can be used (as a substitute for coins) in slot machines
           subtype:  subway_token  a token that is used to pay for entry to the subway system
  subtype:  Ferris_wheel  rotating mechanism consisting of a large upright wheel with suspended seats that remain upright as the wheel turns; provides a ride at an amusement park
  subtype:  gyroscope__gyro  rotating mechanism in the form of a universally mounted spinning wheel that offers resistance to turns in any direction
  subtype:  rotor  rotating mechanism consisting of an assembly of rotating airfoils; horizontal rotors on a helicopter or compressor rotors of a jet engine
     subtype:  main_rotor  rotor consisting of large rotating airfoils on a single-rotor helicopter that produce the lift to support the helicopter in the air
     subtype:  tail_rotor__anti-torque_rotor  rotor consisting of a rotating airfoil on the tail of a single-rotor helicopter; keeps the helicopter from spinning in the direction opposite to the rotation of the main rotor

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