Mechanical Power—A model driven by means other than rubber strands such as compressed air, steam, gasoline, spring, electricity and so forth is termed a mechanical driven model. The power used is termed mechanical power.
Motive Power—In connection with model aëroplanes a number of rubber strands evenly strung from the propeller shaft to the frame hooks which while unwinding furnish the necessary power to propel the model.
Main Beam—In connection with model aëroplanes a long stick which is secured to the under side of the wing frame at the highest point in the curve of the ribs adding materially to the rigidity of the wing.
Monoplane—An aëroplane or heavier than air machine supported by a single main wing which may be formed of two wings extending from a central body.
Multiplane—An aëroplane with more than four wings superposed.
N
Nacelle—The car of a dirigible balloon, literally a cradle. Also applied to short body used in connection with aëroplanes for the accommodation of the pilot and engine.
Net Weight—Complete weight of the machine without pilot, fuel or oil.
O
Ornithopter—A flapping wing machine which has arched wings like those of a bird.