The "skywriting" is done at heights at 10,000 to 15,000 ft and is best only in cloudless skies in which there is light to moderate wind. Writings are commonly made for skywriting over a designated area, e.g., a racetrack, fair, beach, or concert, and for a specified day and time. ![]() Exhaust heat is used to turn a special mix of paraffin oil into thick white smoke, which is discharged through the exhaust system. They are formed by the movements of skywriting airplanes equipped with the smoke-emitting systems. SKYWRITING: an advertising medium in which airplanes spell out names and slogans in the sky by means of the controlled emission of thick smoke. A technique first developed (1922) by J.
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