What is the main function of the propeller pitch change mechanism?

The main function of the propeller pitch change mechanism is to change the angle of attack of the blades. By adjusting the pitch, or angle, of the propeller blades relative to the oncoming airflow, the mechanism can influence the aerodynamic efficiency of the propeller. A higher pitch (more angle) generates more drag and is suited for higher speeds or cruising conditions, while a lower pitch allows for more thrust, which is beneficial during takeoff or climbing.

Changing the angle of attack affects not only the amount of thrust produced but also the engine's performance characteristics, allowing for optimized operation across different phases of flight. This ability to modify the blade's angle enhances the overall efficiency of the propeller in translating engine power into usable thrust. Thus, adjusting the angle of attack through the pitch change mechanism is crucial for managing the aircraft's performance effectively in various flight conditions.