What is used by the pitch change mechanism to adjust the angle of the propeller blades?

The pitch change mechanism of a propeller adjusts the angle of the blades primarily through the application of oil pressure. In aircraft propeller systems, oil pressure is used to move the pitch change mechanism, allowing for precise control of the blade angle. This adjustment is crucial in optimizing the performance of the aircraft in various phases of flight, such as takeoff, cruise, and landing.

Oil pressure works effectively because it can be generated and controlled rapidly, providing the necessary force to move the blades to the desired pitch angle efficiently. This hydraulic action is essential for enabling quick adjustments in response to changes in flight conditions or pilot inputs, ensuring that the propeller operates effectively across different regimes.

In contrast, electric sensors could be involved as part of the control system for monitoring or inputting desired positions, but they don't directly adjust the blade angles. Mechanical levers might be part of the physical mechanisms but are not the primary means used for influencing blade angle. Likewise, hydraulic fluid is essential in the system but works in conjunction with oil pressure to facilitate blade movement rather than directly functioning as the driving force itself.