A twin screw vessel, making headway with...

A twin screw vessel, making headway with...

Question 1 of 2707066636ee728f7522a1c5182b7

A twin screw vessel, making headway with both engines turning ahead, will turn more readily to starboard if you take which action?

Question 1 of 27070

Q

A twin screw vessel, making headway with both engines turning ahead, will turn more readily to starboard if you take which action?

🔍 Key Concepts

• Transverse thrust (propeller walk) on right-hand vs left-hand propellers • Effect of reversing one engine on a twin-screw vessel that is already moving ahead • Interaction between rudder effectiveness and propeller wash

💭 Think About

• First, decide which way a typical right-hand propeller tends to walk when put astern and how that affects the vessel’s bow and stern. • Think about what happens if the port engine is reversed while the ship still has headway with both screws originally going ahead—what happens to the stern and which way will the bow tend to swing? • Consider whether the rudder is more or less effective when you keep propeller wash flowing directly over it versus when you remove or reverse that wash on one side.

✅ Before You Answer

• Be clear on which direction a right-hand propeller in reverse pushes the stern (and thus swings the bow). • Confirm whether the scenario assumes conventional outward-turning screws when going ahead (port left-hand, starboard right-hand). • Check which engine reversal (port or starboard) combined with rudder position will most strongly support a turn to starboard given existing headway.