Tetrahedral kite

The cells are usually arranged in such a way that the entire kite is also a regular tetrahedron.

[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".

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 large number of structural spars makes it relatively heavy and it requires moderate to strong winds.