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Aircraft

Early Theories Of Air Travel, Lighter-than-air Aircraft, Heavier-than-air Aircraft

An aircraft is a machine used for traveling through the atmosphere supported either by its own buoyancy or by some sort of engine that propels the ship through the air. Aircraft of the former type are known as lighter-thanair ships, while those of the latter type tend to be heavier-than-air machines. Included in the general term aircraft are specific machines such as dirigibles, gliders, airplanes, and helicopters.


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