What does the propeller governor primarily regulate?

The propeller governor primarily regulates propeller speed to ensure optimal performance and efficiency during flight. It automatically adjusts the blade pitch of the propeller based on the engine demand and flight conditions, maintaining the desired RPM of the propeller. This regulation is crucial for various stages of flight, including takeoff, climb, cruise, and landing, as it allows the pilot to maintain the appropriate thrust while minimizing drag and optimizing fuel efficiency.

In contrast, fuel flow is managed by the fuel control system rather than the propeller governor. Similarly, engine RPM is primarily influenced by the engine control system and the throttle settings. Engine temperature is monitored by various sensors and systems, but it is not directly regulated by the propeller governor, which focuses specifically on managing propeller performance rather than overall engine parameters.