What type of control does the mechanical flyweight provide for prop RPM?

The mechanical flyweight provides speed control for propeller RPM by automatically adjusting the pitch of the propeller blades in response to changes in rotational speed. As the engine speed increases, centrifugal force acts on the flyweights, causing them to move outward. This movement triggers a mechanism that alters the pitch of the propeller blades to reduce the angle of attack, maintaining a consistent RPM. This system ensures that the propeller operates efficiently within its designed speed range, contributing to both performance and safety.

The other types of control, such as power, temperature, and pressure, are not directly related to the function of the flyweight mechanism in managing propeller RPM. Power control typically involves regulating the engine's power output, temperature control relates to managing engine heat, and pressure control deals with fluid pressures in systems. The mechanics of the flyweight are specifically tailored to control the speed of the propeller, making speed control the correct answer.