#blade.rotating_mechanism__vane  flat surface that rotates and pushes against air or water
  supertype:  #rotating_mechanism  a mechanism that rotates
  subtype:  #fan_blade  #impeller  #paddle.blade  #rudder_blade
  part of:  #helicopter__chopper__whirlybird__eggbeater  an aircraft without wings that obtains its lift from the rotation of overhead blades
  part of:  #oar  an implement used to propel or steer a boat
  part of:  #propeller__propellor  a mechanical device that rotates to push against air or water
  part of:  #turbine  rotary engine in which the kinetic energy of a moving fluid is converted into mechanical energy by causing a bladed rotor to rotate
  part of:  #aerogenerator__windmill__wind_generator  generator that extracts usable energy from winds

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