What components govern propeller RPM at a desired speed setting?

The correct response highlights the critical role of fly weights and the speeder spring in governing propeller RPM at a desired speed setting. The governor system functions to maintain the propeller RPM within a specific range during flight.

Fly weights are part of a centrifugal system that responds to changes in rotational speed. As the engine speed increases, the fly weights pivot outward due to centrifugal force, which in turn impacts the governor's mechanism. When the RPM is below the set point, the speeder spring exerts a force that opposes the fly weights, allowing more fuel to flow to the engine to increase speed. Conversely, if the RPM exceeds the desired level, the fly weights overcome the speeder spring's force, reducing the fuel flow to decrease engine speed.

This balanced interaction enables the system to maintain consistent propeller RPM, ensuring optimal engine performance and efficiency during various phases of flight. The significance of both components underscores how they work together to achieve and sustain the pilot's desired RPM setting.