🔍 Key Concepts

• twin-screw maneuvering: how port and starboard propellers can work against each other to pivot the vessel • effect of rudder angle when stopped (no water flow over the rudder) • difference between turning the bow while moving ahead/astern vs turning in your own length with no way on

💭 Think About

• Ask yourself: when the ship has no way on, is there enough water flowing past the rudders for them to be very effective? • Which engine combination will create a strong turning moment (twisting force) around the vessel’s center without driving the ship significantly ahead or astern? • Look at each option and picture the track: which one tends to make the vessel walk forward or backward rather than spinning nearly in place?

✅ Before You Answer

• Verify which setups actually give opposite thrust directions on each side of the vessel. • Consider how much propeller wash over the rudder you get when the vessel is not moving through the water. • Check whether putting both engines the same direction will mostly translate the vessel (ahead/astern) rather than pivoting ‘in your own water’.