Sky Writing Billboards Works DVD Chevrolet (1935)
Short film Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns as to create writing readable by someone on the ground. The typical smoke generator consists of a pressurized container holding a low viscosity oil. The oil is injected into the hot exhaust manifold causing it to vaporize into a huge amount of dense white smoke. Skywriting is never a permanent process - winds and dispersal of this smoke cause the writing to blur, usually rapidly. However special "skytyping" techniques have been developed to write in the sky in a dot-matrix fashion, and are legible in spite of the inevitable blurring effect caused by winds.
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