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The radio control helicopter (also known as the RC helicopter) is a model aircraft that is different from the RC aircraft due to the difference in structure, aerodynamics and flight training.RC helicopters have several basic designs, some of which (such as designs with collective spacing, which means blades that rotate on the longitudinal axis to change or reverse lift) are more operational than others.More motor designs tend to be more difficult to fly, but benefit from greater stunt flight capabilities.
Flight control allows the pilot to control the collective and throttle (usually connected together), cycle control (lean and roll), and tail oars (sideways ).The unified control of these allows the helicopter to perform most of the same flights as the full-size helicopter, such as hover and backward flight, while many full-size helicopters cannot perform.Various helicopter controls are achieved through small servo motors, commonly referred to as servo motors.
The piezoelectric gyro is usually used on the tail rotor (transverse pendulum) control to counter the tail motion caused by wind and torque reactions.The gyro itself does not apply mechanical force, but adjusts the control signal electronically to the tail rotor servo.In the past, the engine was usually a two-stroke motor driven by methanol, but now it is more common to be an electric brushless motor combined with a high-performance lithium polymer battery (or lipo, and improved efficiency compared with the brush motor, performance and life have decreased, while the price has also decreased, which allows enthusiasts to reach.
Gasoline and jet turbine engines are also used.Common power supplies include Nitro (nitromethane methanol internal combustion), batteries, gas turbines, gasoline and gasoline.The mechanical layout includes a mix of cycle/collective spacing (CCPM) in all power supplies, fixed pitch electric rotors, and coaxial electric rotors ).
Practical electric helicopters have only recently developed, but they have developed rapidly and become more and more common, surpassing the commonly used Nitro helicopters.Gas turbine helicopters are also becoming more and more popular, although the high cost makes it impossible for most people to reach them.The Nitro or glowing fuel helicopter has different sizes: 15, 30, 50, 60 and 90.
These numbers are derived from the engine size used in different models (0.30 cu in, 0.50 cu in, etc ).The bigger and stronger the engine, the bigger the main rotor blades it can turn, so the bigger the plane as a whole.The typical flight time of the Nitro helicopter is 7-14 minutes according to engine size and adjustment.
The maximum operating height of the RC helicopter, whether it is a nitro or an electric helicopter, is limited to the height of the model that the controller can see.Most radio systems have a range of more than a mile, and the person controlling the model has long been unable to see the model.Two small electric helicopters appeared in the 1990 s.
These is kalt Whisper and Kyosho EP concept equipped with Brush Motor of 7/8 1200 mah NiCad battery.However, the motor with brush size of 540 is limited by current consumption, usually 20-There are 25 amps on the "hotter" motor, so it is common to have brush and switch problems.Recent advances in battery technology have made electric flight more feasible in flight time.
The lithium polymer (LiPo) battery is able to provide the high current required for high performance stunt flight while keeping it light.The typical flight time is 4-12 minutes depending on the flight mode and battery capacity.Small fixed helicopter needs 4-Channel Radio (throttle, elevator, aileron, rudder) although 2-There is also a channel infrared control system;While the collective pitch model requires at least 5 channels, 6 of which are the most common (throttle, collective pitch, elevator, aileron, rudder, and gyro gain ).
Due to the normal interaction of various control mechanisms, the advanced radio includes adjustable mixing functions such as throttle/collective and throttle/rudder.RC helicopters typically have at least four controls: a roll-around cycle section, an elevator (front and rear cycle section), a rudder (sideways), and a joint/throttle (collective joint/power )