Radio Control Helicopters for Sale:
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RC Helicopters:
A radio-controlled Helicopter model (or RC
Helicopter model) is a model that is steerable with the use of radio control.
All types of vehicles imaginable have had RC systems installed in them,
including cars, boats, planes, and even helicopters and scale railway
locomotives.
History Of Radio Control:
 Radio control has been around since the late 1800s with Nikola Tesla having
demonstrated a remote control boat in 1893. The World War II era saw increased
development in radio control technology. The Luftwaffe used controllable winged
bombs for targeting Allied ships. During the 1950s pioneering work was done by
enthusiastic amateurs to create valve based control units. Originally simple
'on-off' systems these evolved to use complex systems of relays to control speed
and direction. The information was encoded by varying the signals mark/space
ratio (pulse proportional).
Rapidly commercial versions of these systems
became available. The tuned reed system brought new sophistication, using metal
reed switches to resonate with the transmitted signal and operate one of a
number of different relays. In the 1960s the availability of transistor based
equipment led to the rapid development of fully proportional servo-based
systems, again driven largely by amateurs but resulting in commercial products.
In the 1980s, integrated circuits made the electronics cheap, small and light
enough for multi-channel fully proportional control to become widely available.
In the 1990s miniaturised equipment became widely
available, allowing radio control of the smallest models, and by the 2000s radio
control was commonplace even for the control of inexpensive toys. At the same
time the ingenuity of modellers has been sustained and the achievements of
amateur modelers using the latest technology has extended to such subjects as
gas-turbine powered aircraft, aerobatic helicopters and submarines, to
name but a few examples.
Before the days of radio control many models would use simple burning
fuses or clockwork mechanisms to control flight or sailing times. Sometimes
clockwork controllers would also control and vary direction or behaviour. Other
methods included tethering to a central point (popular for cars and
hydroplanes), round the pole control for electric model aircraft and control
line (USA: u-control) for internal combustion powered aircraft.
RC
Helicopters for sale.
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