Manoeuvring

Question 1

What are some different types of interaction?

Answer 1

• Bank effect
• Squat
• Vessel proximity / overtaking

Question 2

What is bank effect?

Answer 2

A vessel navigating close to a gently shelving bank will experience forces pushing the bow away from and drawing the stern towards the bank

Question 3

What is squat?

Answer 3

Squat is the hydrodynamic effect which causes a reduction in buoyancy. As the vessel moves through the water it displaces the water around the ship this creates an area of low pressure under the ship, leading to a reduction in buoyancy. This effect is most critical when the depth of water is less than twice the draught

Question 4

What can happen if a vessel is overtaking another in close proximity?

Answer 4

Interaction between the vessels is expected to be stronger and more hazardous in an overtaking situation due to the pressure differences between the ships’ sides. It is likely in this situation that the smaller vessel may take a sheer into the path of the large vessel.