Which of the following propulsor types does not require the use of a separate rudder for steerage?

Correct Answer: Option B — Cycloidal propellers.

Cycloidal propellers, such as the Voith Schneider design, utilize vertical blades that oscillate to produce thrust in any direction. By varying the blade pitch and orientation, the unit provides both propulsion and steering simultaneously, eliminating the mechanical requirement for a traditional rudder assembly to maintain directional control.