#propeller__propellor  a mechanical device that rotates to push against air or water
  supertype:  #mechanical_device  mechanism consisting of a device that works on mechanical principles
  part:  #blade.rotating_mechanism  #hub
  subtype:  #airplane_propeller__airscrew__prop  a propeller that rotates to push against air
  subtype:  #screw_propeller__screw  a propeller with several angled blades that rotates to push against water or air
  subtype:  #variable-pitch_propeller  propeller for which the angle of the blades is adjustable

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