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A tetrahedral kite is a multicelled rigid box kite composed of shaped cells to create a kind of space frame. The cells are usually arranged in such a way that the entire kite is also a regular tetrahedron. The kite can be described as a compound dihedral kite as well.
This kite was invented by Alexander Graham Bell. It came about from his experiments with Hargrave's box kites and his attempts to build a kite that was scalable and big enough to carry both a man and a motor. As such, it was an early experiment on the road to manned flight. He worked on the kites between 1895 and 1910. "History of Aviation", GlobalAircraft.org 2008 Bell wrote about his discovery of this concept in the June 1903 issue of National Geographic magazine; the article was titled "Tetrahedral Principle in Kite Structure".Alexander Graham Bell (June 1903) "Tetrahedral principle in kite structure," National Geographic Magazine, 14 (6) : 219–251. Also available on-line at: Catch-the-wind.de.
From an initial one-cell model, Bell advanced to a 3,393-cell "AEA Cygnet in 1907. This 40-foot-long (12.2 m), 200-pound (91 kilogram) kite was towed by a steamer offshore near Baddeck, Nova Scotia, on December 6, 1907, and carried a man 168 feet (51.2 metres) above the water.
Bell also experimented with a large circular "tetrahedral truss" design during the same period.
The tetrahedral kite is stable and easy to fly, but is not a light-wind kite. The large number of structural spars makes it relatively heavy and it requires moderate to strong winds.
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