Editing Control line (section)

==History==
Early versions merely constrained the model to fly in a circle but offered no control. This is known as [[round-the-pole flying]]. The origins of control-line flight are obscure, but the first person to use a recognizable system that manipulated the control surfaces on the model is generally considered to be Oba St. Clair, in June 1936, near Gresham, Oregon.<ref>{{Cite web|url=http://obastclair.com/|title=Oba St. Clair - Inventor of Line Controlled Airplanes|website=obastclair.com}}</ref> St. Clair's system used a rather large apparatus similar to a television antenna, onto which many lines were attached. This system is very different from those currently in use on modern control line models.  It is of interest to note that St. Clair only produced one model, the Miss Shirley, that used this system, which he called "the Full House." To date, there is no evidence to show anyone else ever built a plane to use the Full House system.

The name most associated with the inventions and promotion of control line, and the inventor of the formerly patented system known as "U-Control" (which was a trademark, and is the system in use on virtually every two-line control line model today) was Nevilles E. " Jim" Walker.<ref>{{Cite web|url=https://www.americanjuniorclassics.com/|title=Jim Walker-American Junior Aircraft history, balsa model planes|website=www.americanjuniorclassics.com}}</ref> His "American Junior" company was by far the biggest producer of models and held numerous patents on the two-line system until overturned during a patent infringement suit by Walker against [[Leroy M Cox]], based on "[[prior art]]" from St. Clair in the 1955 trial.<ref>Thornburg, Dave: ''Do you Speak Model Airplane'', page 142-157. Pony X Press, 1992.</ref> One of the most coveted prizes in control-line aerobatics competition sanctioned by the [[Academy of Model Aeronautics|AMA]], awarded to the winner of a flyoff between the US Junior, Senior, and Open age class Champions, was originally provided by and is named for Walker. This is one of the oldest perpetual trophies in modeling that is still awarded.