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Nikola Tesla demonstrates a remote controlled boat.
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Brothers Bill and Walt Good develop vacuum tube controls for remote control hobbies.
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Transistors replace vacuum tubes to provide digital control.
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The 1970's had low cost, multi-function, reliable radio control equipment. Integrated circuits made the controls smaller and cheaper.
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Water Tight Cylinders were developed and marketed where a model sub's "dive and drive" systems could be moved from model to model and you no longer had to remove dozens of nuts that fastened down the hatches of older "bulkhead" style subs to work on the running gear.
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Most remote controls now use 2.4 Gigahertz (GHz) signals, but it doesn't travel well through water. So even though technology advanced, the older signals around 27 megahertz (MHz) travel better through water.
