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propeller protractor

 propeller protractor

  • Protractors are tools for measuring angles in degrees.
  •  Various types of protractors are used to determine the travel of flight control surfaces.
  •  One protractor that can be used to measure aileron, elevator, or wing flap travel is the universal propeller protractor.
  • This protractor is made up of a frame, disk, ring, and two-spirit levels.
  •  The disk and ring turn independently of each other and of the frame.
  •  (The center spirit level is used to position the frame vertically when measuring propeller blade angle.) The center spirit level is used to position the disk when measuring control surface travel.
  •  A disk-to-ring lock is provided to secure the disk and ring together when the zero on the ring vernier scale and the zero on the disk degree scale align. The ring-to-frame lock prevents the ring from moving when the disk is moved.

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