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skywriting
Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns that create writing readable by someone on the ground. The message is often a frivolous phrase, a generally meaningless greeting, or an advertisement aimed at everyone in the vicinity, a general public display of celebration or goodwill, or a personal message, such as a marriage proposal or birthday wish.
==Description==
The typical smoke generator consists of a pressurized container holding a low viscosity oil, such as Chevron/Texaco "Canopus 13", formerly "Corvus Oil". The oil is injected into the hot exhaust manifold, causing it to vaporize into a huge volume of dense, white smoke.
Wake turbulence and wind cause dispersal and shearing of the smoke causing the writing to blur and twist, usually within a few minutes. However special "skytyping" techniques have been developed to write in the sky in a dot-matrix fashion (a new letter every 2–5 seconds instead of every 1–2 minutes), and are legible for longer than traditional skywriting.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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