Which statement about tunnel bow thrusters...

Which statement about tunnel bow thrusters...

Question 1 of 2707066636ee728f7522a1c518aef

Which statement about tunnel bow thrusters fitted to large vessels is TRUE?

Question 1 of 27070

Q

Which statement about tunnel bow thrusters fitted to large vessels is TRUE?

🔍 Key Concepts

• Tunnel bow thruster limitations with respect to vessel speed • Effect of water flow past the hull on thruster performance (ahead vs astern) • How draft and immersion depth of the thruster affect its efficiency

💭 Think About

• Think about what happens to the sideways jet from a tunnel bow thruster when the ship is making several knots of headway in open water. • Consider whether a bow thruster can really replace a tug in terms of overall steering and pushing power on a large ship. • Ask yourself how the ships draft (deep vs light) changes how much of the thruster opening is submerged and how that might affect thrust.

✅ Before You Answer

• For each choice, check whether it matches known speed limits where tunnel thrusters lose effectiveness (usually at just a few knots). • Verify whether thrusters are designed for low-speed, close-quarters maneuvering, not for normal steering at sea speed. • Check if thruster performance depends on being well submerged and protected from air drawing or ventilation, especially at lighter drafts.