Your vessel is backing on the starboard...

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Question 1 of 2066636ee728f7522a1c518edb

Your vessel is backing on the starboard screw, and going ahead on the port screw. How will the vessel react?

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Question 1 of 20

66636ee728f7522a1c518edb

Your vessel is backing on the starboard screw, and going ahead on the port screw. How will the vessel react?

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🔍 Key Concepts

• Effect of a single right-hand (starboard) screw going astern on the vessel’s stern and bow • Effect of a single left-hand (port) screw going ahead on the vessel’s stern and bow • Resultant turning moment when two screws are turning in opposite directions (one ahead, one astern)

💭 Think About

• First imagine what the vessel would do if ONLY the starboard screw were backing — which way would the stern and bow tend to move? • Then imagine what the vessel would do if ONLY the port screw were going ahead — which way would the stern and bow tend to move? • Now combine those two effects: which side’s thrust is ‘pulling’ the stern more strongly, and what does that do to the bow?

✅ Before You Answer

• Verify the usual direction of rotation for a right-hand propeller and how it walks the stern when going astern • Verify the usual direction of rotation for a left-hand propeller and how it walks the stern when going ahead • Confirm whether the combined thrust tends to move the vessel more sideways with a swing of the bow rather than straight ahead or astern

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Question 1 of 2066636ee728f7522a1c518edb

Your vessel is backing on the starboard screw, and going ahead on the port screw. How will the vessel react?

Back

Question 1 of 20

66636ee728f7522a1c518edb

Your vessel is backing on the starboard screw, and going ahead on the port screw. How will the vessel react?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed