Which statement is most true regarding a controllable pitch fixed RPM thruster?

A controllable pitch fixed RPM thruster is designed to allow for variable blade pitch, enabling the operator to optimize propeller performance depending on operational conditions. This design can lead to higher starting currents because the motor must overcome the inertia of the thruster blades at startup. These high starting currents can sometimes exceed what is typically expected in other types of thrusters.

Potential control failures can occur if there are issues with the control systems that adjust the pitch of the blades. If the thruster's pitch-control mechanism fails, it can affect the overall effectiveness and maneuverability of the vessel. Therefore, the statement regarding high starting currents and potential control failures holds true, aligning with the operational characteristics of a controllable pitch fixed RPM thruster.

Other options do not accurately reflect the nature of this thruster type. For instance, the first option about low starting currents and power consumption does not consider the initial demands on the system. Additionally, claiming maximum efficiency at all times ignores the fact that while the design aims for efficiency, operational variables can affect performance. Finally, the statement that it is less reliable compared to a fixed pitch variable speed thruster overlooks the specific reliability features intrinsic to controllable pitch thrusters. Thus, the assertion about high starting currents and potential control failures