Which component provides automatic speed regulation in a constant-speed propeller?

Which component provides automatic speed regulation in a constant-speed propeller?

• A. Throttle linkage
• B. Fuel pump
• C. Governor
• D. Manual valve

Answer: (C)

Automatic speed regulation for a constant-speed propeller is provided by the governor. The governor monitors the propeller (or engine) speed and uses a hydraulic/pneumatic system to adjust blade pitch in response to speed changes. When the load on the propeller causes speed to drop, the governor shifts the blades to a pitch that allows the engine to regain RPM. When speed tends to rise, it moves the blades to a pitch that increases load and brings the speed back down. The throttle sets the desired power level, but it’s the governor that automatically changes blade pitch to maintain a constant RPM. The fuel pump merely supplies fuel, and a manual valve is for manual or feathering control, not automatic speed regulation.

Automatic speed regulation for a constant-speed propeller is provided by the governor. The governor monitors the propeller (or engine) speed and uses a hydraulic/pneumatic system to adjust blade pitch in response to speed changes. When the load on the propeller causes speed to drop, the governor shifts the blades to a pitch that allows the engine to regain RPM. When speed tends to rise, it moves the blades to a pitch that increases load and brings the speed back down. The throttle sets the desired power level, but it’s the governor that automatically changes blade pitch to maintain a constant RPM. The fuel pump merely supplies fuel, and a manual valve is for manual or feathering control, not automatic speed regulation.