Remote Control Helicopters

Remote Control Helicopters - Do you know the helicopter? who is not familiar with this thing. Radio-controlled helicopters (also RC helicopters) are model aircraft which are distinct from RC airplanes because of the differences in construction, aerodynamics, and flight training. Several basic designs of RC helicopters exist, of which some (such as those with collective pitch, meaning blades which rotate on their longitudinal axis to vary or reverse lift) are more maneuverable than others. The more maneuverable designs are often harder to fly, but benefit from greater aerobatic capabilities.

Helicopters are great fun, they can be very easy to fly, and anyone can be taught to fly them. The way to start is just buy one of the simple coaxial models available at drug stores Wal-Mart or online. They fly themselves; basically, the twin rotors on the coaxial system are designed to do all the controlling forward backward up and down.

Then comes the real helicopters, fly bars or flybarless heads. Where, you have to control everything. These machines come with all the controls that are available on a full-scale helicopter, but they are available in trainers. And of course as always, one starts with a trainer. The learning curve on this type of helicopter is much steeper, but it can be done

Flight controls allow pilots to control the collective and throttle (usually linked together), the cyclic controls (pitch and roll), and the tail rotor (yaw). Controlling these in unison enables the helicopter to perform most[citation needed] of the same maneuvres as full-sized helicopters, such as hovering and backwards flight, and many that full-sized helicopters cannot.

The various helicopter controls are effected by means of small servo motors, commonly known as servos. A piezoelectric gyroscope is typically used on the tail rotor (yaw) control to counter wind- and torque-reaction-induced tail movement. This "gyro" does not itself apply a mechanical force, but electronically adjusts the control signal to the tail rotor servo.

The engines typically used to be methanol-powered two-stroke motors, but electric brushless motors combined with a high-performance lithium polymer battery (or lipo) are now more common and provide improved efficiency, performance and lifespan compared to brushed motors, while decreasing prices bring them within reach of hobbyists. Gasoline and jet turbine engines are also used.

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source: http://en.wikipedia.org/wiki/Radio-controlled_helicopter