Skywriting is the process of using one or more small aircraft, able to expel special smoke during flight, to fly in certain patterns that create writing readable from the ground. These messages can be advertisements, general messages of celebration or goodwill, personal messages such as a marriage proposals and birthday wishes, or acts of protest.
The typical smoke generator consists of a pressurized container of viscous oil, such as Chevron/Texaco "Canopus 13" (formerly "Corvus Oil"). The oil is injected into the hot exhaust manifold, vaporizing it into a huge volume of dense white smoke.
Relatively few pilots have the skills to skywrite legibly. Also, wake turbulence and wind disperse and shear the smoke, causing the writing to blur and twist, usually within a few minutes. For these reasons, computer-controlled "skytyping" has been developed where multiple small aircraft, flying in line abreast formation, write in dot-matrix fashion, creating messages that can be much longer, and legible for longer periods, than those of traditional skywriting.Template:Cn
A newspaper paragraph says skywriting was perfected in England in 1919 and used in the United States the next year. But Art Smith, who succeeded Beachey in flying exhibitions at the Panama–Pacific International Exposition in San Francisco in 1915, after the latter had been killed, did skywriting, always ending his breathtaking stunts by writing "Good night." This was not a trial exhibition, but a part of every flight, and was always witnessed by thousands.<ref>"Skywriting in 1915," The New York Times, October 9th, 1926, p. 16</ref>File:Royal Aircraft Factory SE5a ‘G-EBIB’ (19066222815).jpgG-EBIB, one of the S.E.5 former fighter aircraft used for skywriting by Major Jack Savage's company between 1922 and 1934.<ref>Template:Cite web</ref>
Commercial skywriting in the United States was developed in 1932 by Sid Pike, president of the Skywriting Corporation of America. One of their first major clients was Pepsi-Cola, which used skywriting to reach a mass market. Pepsi contracted a tremendous number of flights, including 2,225 in 1940.<ref>Template:Cite web</ref>
Artists have also used skywriting as a visual medium. Skywriter Wayne Mansfield created aerial messages for John Lennon and Yoko Ono, and appeared as a sky artist over the Biennale in Venice, Italy. Artist Vik Muniz used skywriting for his "Pictures of Clouds" project.
In 1946 the Skywriting Corporation purchased a fleet of surplus World War II planes and developed "dot matrix skywriting", subsequently known as skytyping. The process uses five planes, flying in line abreast formation, releasing puffs of smoke under computer control, similar to characters produced by dot-matrix printers. These messages, written at Template:Convert, can be up to Template:Convert tall and over Template:Convert long. Traditional skywriting messages are limited to Template:Convert and take much longer to write (1–2 minutes/character, vs. 2–5 seconds/character with skytyping), limiting messages to no more than a few words before the smoke disperses. Template:Citation needed
Another form of skywriting is using an aircraft to tow a banner, a medium that has been popular in the United States for decades. It is usually practiced in coastal areas, where aircraft can fly at low levels past crowded beaches. Banner towing is a popular way to make a romantic marriage proposal.Template:Citation needed
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