Learning to fly in the U.S. Army

by E. N. Fales

32. Cotter Pins.—Must be on every nut.

33. Castelled Nuts.—Admit cotter pins.

34. Turnbuckles.—Must be well and evenly threaded and locked with safety wires.

35. Safety Wires.—For locking turnbuckles and hinge pins.

36. Shackle and Pin.—

37. Hinge Connections.—

38. Leading Edge or Entering Edge.—The front edge of a plane.

39. Trailing Edge.—The rear edge of a plane.

40. Stagger.—The horizontal distance that the entering edge of the upper wing of a biplane is ahead of the entering edge of the lower wing.

41. Dihedral Angle.—A term used to denote that the wings are arranged to incline slightly upward from the body toward their tips. The angle made with the horizontal by this inclination of the wing is called the dihedral angle.