![]() In another more sophisticated version developed by the Good brothers called TTPW, information was encoded by varying the signal's mark/space ratio (pulse proportional). ![]() ![]() Originally simple 'on-off' systems, these evolved to use complex systems of relays to control a rubber powered escapement's speed and direction. Later, after WW2, in the late 1940s to mid 1950 many other R/C designs emerged and some were sold commercially, Berkeley's Super Aerotrol, was one such example. Ed Lorenze published a design in Model Airplane News that was built by many hobbyists. Their "Guff" radio controlled plane is on display at the National Aerospace museum. During the 1930s the Good brothers Bill and Walt pioneered vacuum tube based control units for R/C hobby use. The Luftwaffe used controllable winged bombs for targeting Allied ships. World War II saw increased development in radio control technology. Radio control has been around since Nikola Tesla demonstrated a remote control boat in 1898. Patent 613,809 - Method of an Apparatus for Controlling Mechanism of Moving Vehicle or Vehicles). In 1898, Tesla demonstrated a radio-controlled boat ( U.S.
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