On a twin-screw, twin-rudder vessel, the most effective way to turn in your own water, with no way on, is to put __________.

Correct Answer: Option A — one engine ahead and one engine astern, with full rudder

Executing a zero-radius turn with no headway requires maximum rotational couple and turning moment. Putting one engine ahead and the other astern creates opposing longitudinal forces, while full rudder maximizes propeller wash deflection to pivot the vessel in its own water.