| 词条 | Tetrahedral kite |
| 释义 |
A tetrahedral kite is a multicelled rigid box kite composed of tetrahedrally shaped cells to create a kind of tetrahedral truss. 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.[1] 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".[2] From an initial one cell model, Bell advanced to a 3,393 cell "Cygnet" model in 1907. This 40-foot (12.2 m) long, 200 pound (91 kilogram) kite was towed by a steamer offshore near Baddeck, Nova Scotia on 6 December 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.[3] The tetrahedral kite is stable and easy to fly, but is not a light-wind kite. The large number of structural spars make it relatively heavy and it requires moderate to strong winds. See also
References1. ^"History of Aviation", GlobalAircraft.org 2008 2. ^Alexander Graham Bell (June 1903) [https://books.google.com/books?id=TAUVAAAAYAAJ&pg=PA219 "Tetrahedral principle in kite structures,"] National Geographic Magazine, 14 (6) : 219-251. Also available on-line at: Catch-the-wind.de. 3. ^https://www.lomography.com/magazine/333099-in-pictures-tetrahedral-kites-by-alexander-graham-bell External links
1 : Kites |
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