What is adjusted inside the governor for a constant-speed propeller to change the speed at which the propeller is operating?

What is adjusted inside the governor for a constant-speed propeller to change the speed at which the propeller is operating?

• A. The compression of the speeder spring.
• B. The oil pressure setting.
• C. The blade angle.
• D. The governor spring tension.

Answer: (C)

Changing the blade angle is what actually sets the propeller’s operating speed. In a constant‑speed propeller, the governor continually adjusts oil pressure to the prop hub to move the blade pitch in or out. When the RPM tends to rise, the governor increases blade angle (more pitch), which adds drag and brings the speed back down. When RPM tends to fall, the governor reduces blade angle (less pitch) to increase speed. The pilot’s control adjusts the governor’s setting, but the observable speed change comes from how the blade angle is changed. The speeder spring, oil-pressure setting, and governor spring tension are part of the mechanism that makes this possible, but the actual speed change is accomplished by altering blade angle.

Changing the blade angle is what actually sets the propeller’s operating speed. In a constant‑speed propeller, the governor continually adjusts oil pressure to the prop hub to move the blade pitch in or out. When the RPM tends to rise, the governor increases blade angle (more pitch), which adds drag and brings the speed back down. When RPM tends to fall, the governor reduces blade angle (less pitch) to increase speed. The pilot’s control adjusts the governor’s setting, but the observable speed change comes from how the blade angle is changed. The speeder spring, oil-pressure setting, and governor spring tension are part of the mechanism that makes this possible, but the actual speed change is accomplished by altering blade angle.