From RC Helicopter Wiki
A name sometimes given to the control of the tail. "Giving rudder input" is the same as causing the tail of the helicopter to move in a particular direction (and consequently, the nose to move in the opposite direction). The rudder channel on Mode 2 transmitters is located on the left stick. Most heli pilots learn to fly by moving the rudder in such a way as to influence the nose to move in the intended direction. This is called "flying the nose" of the aircraft. For example, as you fly, you may want the helicopter to turn to the left. This requires the nose to move left, so you feed in left rudder, which moves the tail right but moves the nose left. You feed inputs to the tail based on where you want the nose to go.
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