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Show ON PRINCIPLE OF BOOMERANG Airplane Constructed Along Sama Lines as the Famous Weapon of Australian Bushmen. Although an anomaly to go to th primitive savages of Australia for i points on an airplane, that was Just what was done In the development ' of (lying In the ulr by humans. The fundamental principle of the plane Is both old and simple, having been discovered dis-covered by the bushmen of the antipodes antip-odes and embodied by them In the boomerang, which by meeting In Its flight the air at a slight angle got a "lift." The trajectory of the boomerang may be In part horizontal or may even rise as a result of this lift. Any surface sur-face that Is more or less flat that travels trav-els at a slight angle through the air tends to lift. If the section has a slight camber, or convex curve,' the lift Is Increased. Better results are obtained If a body of appreciable thickness is used Instead of a thin sheet. These points the Australian discovered. dis-covered. Investigation will show IHtle difference differ-ence between the wing section of the modern airplane and a cross section of a boomerang made by the bushmen or whittled by a New York boy after he had visited the circus and had witnessed wit-nessed the stunts of the boomerang throwers. The resemblance of the boomerang's cross section Is closer to a propeller section of an airplane, as n boomerang is a sort of cross between an airplane wing and a propeller. |