What is the primary purpose of the tail rotor system?

The primary purpose of the tail rotor system in a helicopter is to counteract the torque effect generated by the main rotor. As the main rotor spins in one direction, it creates a reactive torque that would cause the helicopter body to spin in the opposite direction. The tail rotor provides a horizontal thrust that counters this torque, allowing for controlled yaw movements and stability during flight.

By adjusting the pitch of the tail rotor blades, pilots can effectively manage the helicopter's orientation and maintain straight flight. This functionality is crucial for ensuring that the pilot has control over the helicopter, especially during takeoff, landing, and maneuvering. Without the tail rotor system, the helicopter would be difficult to control and could rotate uncontrollably due to the torque produced by the main rotor.