Rotation of the Controllable Pitch Propeller (CPP) blades is achieved through axial movement of what component in the hub body assembly?

Correct Answer: Option D — The crosshead

In a controllable pitch propeller (CPP) hub, the crosshead acts as the mechanical linkage between the hydraulic servomotor piston and the blade trunnions. As the piston moves axially, the crosshead translates this linear motion into rotational force, adjusting the blade pitch angle to control thrust and vessel speed.