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Assessment: The Tugboat Wake and the Coanda Effect

1 Maggio 2022

|By Maurizio Garipoli

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Domanda 1 of 6

1. Domanda

Why is it important to know the existence of wake effects?

As they affect the environment around the ship's hull
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Because the water movement is so powerful that it disturbs other ships in the area
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Because they move vast masses of water by making the ship work in a partial vacuum
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2. Domanda

How can we intervene to reduce the risks associated with the passage of other ships?

You need to use tugs working on the towline and not pushing
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It is necessary to move one tugboat to the centre and let go of the others. A single tug makes less wake
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The first thing to do is to decrease the thrust. If this is not possible, the passing ships must stop
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3. Domanda

What is the Coanda effect?

It is the tendency of a liquid, pushed with a continuous force, to follow the surface contour towards which it is directed
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It is the effect of the wave added to that of the current
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It is the tendency of the ship to move towards deeper depths
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4. Domanda

What can cause the Coanda effect to occur during manoeuvring?

The increase in the tugboat pull.
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The increase in the tugboat wake.
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The ineffectiveness of the tugboat pull.
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5. Domanda

How much does the UKC affect wakes and the Coanda effect?

The UKC is irrelevant.
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The less UKC we have, the more force the tug has to apply and the greater the wake effect and the Coanda.
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With poor UKC, the Venturi effect is thus more significant than the effectiveness of the tugs, the wake effect and the Coanda decrease.
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6. Domanda

What’s the danger for vessels passing nearby a manoeuvring vessel?

The risk is the loss of manoeuvrability and control.
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The risk is the loss of steering and course deviation.
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Both the answers are correct.
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