What is the primary function of the tail gearbox?

The primary function of the tail gearbox is to reduce the rotational speed (RPM) of the tail rotor system and provide necessary directional control for the aircraft. In rotary-wing aircraft, the tail rotor is crucial for counteracting the torque produced by the main rotor, which allows the pilot to maintain control over the heading of the helicopter. The tail gearbox achieves this by adjusting the RPM from the main transmission to a level suitable for the tail rotor's operational requirements, ensuring effective thrust and stability.

Additionally, the tail gearbox plays a role in transmitting power from the main rotor system to the tail rotor, enabling the pilot to alter the aircraft's yaw and maintain a stable flight path. A well-functioning tail gearbox is essential for the overall performance and handling of the aircraft, directly influencing its flight safety and maneuverability.