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Airlines
Radio control (often abbreviated to R/C or simply RC) is the use of
radio signals to remotely control a device. The term is used
frequently to refer to the control of model vehicles from a
hand-held radio transmitter. Industrial, military, and scientific
research organizations make use of radio-controlled vehicles as
well.
The first general use of radio control systems in models started in
the early 1950s with single-channel self-built equipment; commercial
equipment came later.The advent of transistors greatly reduced the
battery requirements, since the current requirements at low voltage
were greatly reduced and the high voltage battery was eliminated. In
both tube and early transistor sets the model's control surfaces
were usually operated by an electromagnetic escapement controlling
the stored energy in a rubber-band loop, allowing simple on/off
rudder control (right, left, and neutral) and sometimes other
functions such as motor speed. Crystal-controlled superheterodyne
receivers with better selectivity and stability made control
equipment more capable and at lower cost. Multi-channel developments
were of particular use to aircraft, which really needed a minimum of
three control dimensions (yaw, pitch and motor speed), as opposed to
boats, which can get away with two or one.
