Orthogonal—A flight maintained by flapping wings.
Outriggers—Members which extend forward or rearward from the main planes for the purpose of supporting the elevator or tail planes of an aëroplane.
P
Plane—A surface or wing, either plain or flexed, employed to support or control an aëroplane.
Pilot—One directing an aëroplane in flight.
Pitch—Theoretical distance covered by a propeller in making one revolution.
Propeller—The screw used for driving an aëroplane.
Propeller Bearings—Pieces of bronze tubing or strips of metal formed to the shape of the letter “L” used to mount propellers. Also made from blocks of wood.
Propeller Blank—A block of wood cut to the design of a propeller.
Propeller Spar(s)—The heavy stick or sticks upon which the bearing or bearings of a single or twin propeller model are mounted.