Page "Control line" Paragraph 5
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The origins of control-line flight are obscure but the first person to use a recognizably modern system is generally considered to be Oba St. Clair, in June 1936, near Gresham, Oregon.
Oba ’ s system used a rather large apparatus similar to a television antenna, onto which many lines were attached.
But the name most associated with the 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 modes today.
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 infridgement suit, by Walker, against Leroy Cox, based on " prior art " from St. Clair in the 1955 trial.
One of the most coveted prizes in control-line aerobatics competition, 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.
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