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The rc helicopters are very different from the rc airplanes in the case of aerodynamics, flight control, construction, etc. The cyclic control, the tail control and the collective and throttle are controlled by the flight control. These helicopters mimic the abilities of the real time thing. They can do hovering, backwards flight, etc. as like as the real helicopter. The rc helicopters are controlled by the help of a servo motor. It is commonly known as servo. To counter the wind and torque reaction induced tail movement, piezoelectric gyroscope is typically used. Earlier in rc helicopters, there was methanol powered two-stroke engines. However, now a day’s electric brush fewer motors are replacing those old days’ motors. Gasoline and jet turbine engines are also widely used. For the rc helicopters, nitro or glow fuel is a common fuel. These helicopters come in different sizes like-15, 30, 50, 60 and 90. These numbers came from the engine sizes. The higher the number, the more powerful is the engine. So the helicopter is big. 7-14 minutes is the typical flight time of the nitro fuel helicopters. Most rc helicopters have a range of nearly one mile. Electric rc helicopters are becoming popular gradually. The recent advance in power electronics and battery system has led to the improvement of these types of helicopters. Lithium polymer batteries can provide the device with high current that the device requires. The typical flight time of the electric rc helicopter is around 4-12 minutes depending upon the capacity of the battery. Coaxial electric helicopters are a recent innovation. These types of helicopters can eliminate rotational torque and quickly response if the control signal is given. However, these types of helicopters have some drawbacks. They have very low forward speed, especially when it is outside. The slightest breeze can result in moving upward of the helicopter rather than moving forward. The radio controller for the rc helicopters can cost from $50 to $2000 USD. Rc helicopters generally have four controls- elevator, pitch, rudder and cyclic pitch. There are also competitions held for remote control helicopters. The helicopters perform advanced aerobatics, freestyle runs, etc. Remote control helicopters are both part of hobby and work. Its contribution to our daily life is increasing. One can make a helicopter of his own or take the simpler step which is to buy one. The site given can provide with technically advanced rc helicopters, both for hobbyist’s and one’s who need it for working purpose.
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