You are conning a twin-screw vessel going...

Question 1 / 2707066636ee728f7522a1c5177d4

Question 1 of 2707066636ee728f7522a1c5177d4

You are conning a twin-screw vessel going ahead with rudders amidships. How will the vessel respond if the port screw stops turning?

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Question 1 of 27070

You are conning a twin-screw vessel going ahead with rudders amidships. How will the vessel respond if the port screw stops turning?

🔍 Key Concepts

• Effect of twin-screw operation on heading when one engine changes speed or stops • Relationship between center of thrust and centerline of the vessel • Difference between ahead and astern propulsion effects on turning tendency

💭 Think About

• Visualize the two propellers pushing the ship ahead: what happens to the side force when one of those pushes suddenly disappears? • Think about where the remaining thrust is located relative to the ship’s centerline—on which side—and which way that side force would tend to swing the bow. • Compare this with what happens when you use only one engine ahead on a twin-screw vessel during docking—what direction does the bow tend to swing?

✅ Before You Answer

• Identify which screw (port or starboard) is still turning ahead and providing thrust. • Determine on which side of the centerline that remaining thrust now acts alone. • Confirm whether you are considering ahead propulsion only (no astern or rudder influence) when deciding which way the bow will swing.

Question 1 of 27070

You are conning a twin-screw vessel going ahead with rudders amidships. How will the vessel respond if the port screw stops turning?

The bow will go first to port and then to starboard

The bow will go to port

The vessel will not veer to either side

The bow will go to starboard

Question 1 / 2707066636ee728f7522a1c5177d4

Question 1 of 2707066636ee728f7522a1c5177d4

You are conning a twin-screw vessel going ahead with rudders amidships. How will the vessel respond if the port screw stops turning?

Back

Question 1 of 27070

You are conning a twin-screw vessel going ahead with rudders amidships. How will the vessel respond if the port screw stops turning?