You are the officer on watch and have taken...

Question 1 / 2066636ee728f7522a1c51844e

Question 1 of 2066636ee728f7522a1c51844e

You are the officer on watch and have taken the final drafts of your vessel prior to getting underway. The vessel takes departure and proceeds outbound in a narrow channel. As the vessel increases speed and gains momentum, what will be the effect on the mean draft?

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🔍 Key Concepts

• Squat effect – how a ship’s draft changes when moving ahead in shallow or confined water • Difference between static (sailing) draft and dynamic draft when the ship is making way • Influence of speed in a narrow channel on under-keel clearance

💭 Think About

• Think about what happens to water flow under the hull as speed increases in a restricted channel: does pressure under the keel go up or down? • If the pressure under the keel changes, what does that do to how deeply the ship sits in the water while underway versus stopped? • Compare a ship at rest alongside the pier to the same ship moving fast in shallow water: which situation risks touching bottom first?

✅ Before You Answer

• Identify whether increased speed in a narrow channel tends to raise or lower the ship in the water. • Distinguish clearly between sailing drafts (at rest/very slow) and drafts when the vessel is moving at higher speed in confined waters. • Verify the definition and effect of squat in relation to ship speed and water depth.

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Question 1 of 20

It will decrease in comparison to the sailing drafts

It will increase in comparison to the sailing drafts

It will increase if you decrease speed

It will remain the same as the sailing drafts

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Question 1 / 2066636ee728f7522a1c51844e

Question 1 of 2066636ee728f7522a1c51844e

Back

Question 1 of 20

66636ee728f7522a1c51844e

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Be the first to share your thoughts!

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🔍 Key Concepts

💭 Think About

✅ Before You Answer

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