How does a speed reduction in the transmission gearboxes function?

The speed reduction in the transmission gearboxes functions by reducing the RPM and changing the angle of drive to the tail rotor. In helicopters, the main rotor operates at a higher RPM compared to the tail rotor. To effectively transmit the power from the main rotor to the tail rotor without damaging the components or affecting performance, the transmission gearboxes are designed to reduce the rotational speed. This reduction ensures that the tail rotor operates at its optimal RPM for efficient flight control and stability.

Additionally, altering the angle of drive allows for the correct alignment of the power transmission system, enabling the tail rotor to counteract the torque produced by the main rotor. This is essential for maintaining directional control of the helicopter. The design emphasizes the importance of speed reduction in maintaining effective flight operation and ensuring the overall safety and performance of the aircraft.