🔍 Key Concepts

• How steerable internal duct thrusters work versus fixed bow thrusters • Difference between changing flow direction mechanically and changing pump rotation or pitch • What a vectoring ring does to a water jet or thruster stream

💭 Think About

• Which part of the system actually changes the direction of the water stream exiting the thruster? • If you only reverse the pump rotation or impeller pitch, does that allow thrust in any direction around the compass, or mainly forward/astern? • Think about how a steerable thruster can push the vessel sideways without the vessel moving ahead or astern.

✅ Before You Answer

• Identify which option involves physically redirecting the discharge flow rather than just changing rotation or pitch • Confirm which component is normally used in marine practice to steer a jet or ducted flow around 360° • Eliminate any choices that would only give you ahead/astern thrust instead of full directional control.