What is the primary purpose of the tail rotor system in a helicopter?

The primary purpose of the tail rotor system in a helicopter is to counteract the torque effect of the main rotor. As the main rotor spins and produces lift, it also exerts a rotational force that causes the helicopter body to spin in the opposite direction, which is known as torque. The tail rotor generates thrust in the horizontal plane, allowing the pilot to control the helicopter’s yaw (rotation around the vertical axis) and maintain stable flight. By adjusting the pitch of the tail rotor blades, the pilot can balance the torque created by the main rotor and keep the helicopter oriented correctly during flight.

Understanding this function is crucial for operating and flying helicopters efficiently, as it ensures that the helicopter can be controlled in various situations and prevents unwanted rotation that could lead to loss of control.