What is the function of the reduction gearbox?

The function of the reduction gearbox is crucial in the context of engine mechanics, particularly in managing the output of the engine’s power turbine. It is designed to reduce the high rotational speed of the power turbine, which may typically operate at around 30,000 revolutions per minute (rpm), to a significantly lower output speed of approximately 2,000 rpm. This reduction is essential because it allows the engine to produce usable power at a rate that is appropriate for various applications, such as driving a propeller or other components that require lower speeds to function efficiently and effectively.

By achieving this speed reduction, the reduction gearbox ensures that the engine can operate within safe and optimal parameters while still delivering necessary torque for propulsion or machinery operation. The other options do not accurately describe the primary role of the reduction gearbox in this context, emphasizing why this answer is the most suitable choice.