•Purpose of the tail rotor is to counteract the torque effect of the main rotor

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•As the engine power changes the torque from main rotor changes, and the tail rotor thrust must be varied

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•The tail rotor is also used to control the heading of the helicopter while hovering or when making hovering turns (commonly referred to as “pedal turns”)

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•In forward flight, the anti-torque pedals primarily put the helicopter in trim by compensating for torque