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Skywriting is the process of using a small aircraft, able to expel special smoke during flight, to fly in certain patterns to create writing readable by someone on the ground. The message is often a frivolous or generally meaningless greeting or phrase, 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.
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.
The beginnings of skywriting are disputed. In a 1926 letter to The New York Times, Albert T. Reid wrote:
Major Jack Savage, former RAF pilot and a writer for Flight magazine, had a successful skywriting fleet of Royal Aircraft Factory S.E.5 aircraft in England. He flew throughout the 1920s and 1930s, bringing the practice to America as well. The first use of skywriting for advertising purposes was on November 28, 1922 over New York City.
However, commercial skywriting in the United States was developed in the early 1930s by Sid Pike, founder of the Skywriting Corporation of America in 1932. One of the first major clients was Pepsi-Cola, which used skywriting to reach a mass market. A tremendous number of flights were contracted by Pepsi-Cola, with 2,225 flown in 1940,. Skywriting has also been used at times by artists. Skywriter Wayne Mansfield flew for John Lennon and Yoko Ono, and he appeared as a sky artist over the Biennale in Venice, Italy. Artist Vik Muniz used skywriting for his "cloud cloud" project.
In 1946 the Skywriting Corporation found themselves with a fleet of surplus World War 2 planes and developed dot matrix skywriting, or skytyping. Skytyping is the process of using five planes in formation to choreograph puffs of smoke being released from each plane. The messages, written at 10,000 foot altitude, can be up to 1250 feet tall and over five miles long. Traditional Skywriting letters are 3,000 feet high and take longer to write.
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