RC airplane transmitter
RC airplane transmitters from beginner to professional
What is the difference between 3 channel and 4 channel RC plane?
For example rudder movement or electric motor on/off.
Two channels could be rudder and motor while three channels could be motor, rudder and elevator (or motor, ailerons and elevator).
A typical 4-channel rc airplane will have motor, ailerons, elevator and rudder control; the four primary rc airplane controls.