Helicopters
They are a very popular thing right now all due to the electric radio controlled helicopters. It used to be getting in to flying RC helicopters was very expensive and the learning curve was very steep, you'd spend a bunch of money make a mistake and spend some more money fixing the mistake. What's new is that they are coming out with some really great electric helicopters that for the most part have revolutionized the RC helicopter market and brought it to a point where just about anyone that has some patients and the desire can learn how to fly them. Here is a quick description of basically what each radio (transmitter) does.
3 Channel Transmitter
The 3 channels means that there are 3 channels on the remote that control the motion of the helicopter. On a 3 channel helicopter the 3 channels would control the following: up/down(Channel 1), turn left/right(channel 2), and forward/back(channel 3). The forward and backwards motion on a 3 channel is usually controlled by a small tail propeller that spins clockwise or counter-clockwise to slightly push or pull the helicopter forwards and backwards. The hovering is very stable but forward and reverse speeds are very limited.
See Training Videos 4 Channel Transmitter
The 4 channels means there are 4 channels on the remote that control the motion of the helicopter. he 4 channels would control the following: up/down(channel 1), turn left/right(channel 2), forward/back(channel 3), and left/right lean aka aileron(channel 4). The 4 channel helicopter is different from a 3 channel in that a tail rotor is not used to control the forward and backwards movement. The forward and backward motion on a 4 channel is more pronounced and gives the helicopter more agility over a 3 channel.
See Training Videos 6 Channel Transmitter
The reason you would want more than 4 channels is so you can adjust more things from the remote without having to land or approach the helicopter. Some people have a control to adjust the fuel-air mixture of their engine while in flight for example, tune the sensitivity of your gyro by using yet another channel, a governor to control the RPMs the engine is running at, picking a preset RPM requires yet another channel. For regular flying, only the two sticks are used on the remote control as is the same on the 3 or 4 channel.
See Training Videos So which is best for you?
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