Which statement about a tunnel bow thruster...

Which statement about a tunnel bow thruster is TRUE?

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🔍 Key Concepts

• Tunnel bow thruster effectiveness vs. ship speed (when does water flow past the hull overpower the thruster’s side thrust?) • Effect of current and headway on a bow thruster (what happens when water is flowing strongly along the hull?) • What forces a bow thruster can and cannot produce (lateral vs. ahead/astern forces)

💭 Think About

• Think about how a tunnel bow thruster works: where is it located and which direction does it push the bow? Does it create forward/backward thrust, sideways thrust, or both? • Consider what happens to the sideways jet from the thruster when the ship is moving ahead at several knots—does that jet stay effective, or does the longitudinal flow wash it out? • Ask yourself which options claim the thruster can do something similar to a main engine or rudder (like slowing the ship or holding against a strong current) and whether that matches the thruster’s actual purpose.

✅ Before You Answer

• Check which option describes only lateral control vs. any change in forward/astern speed or stopping ability. • Verify which speed range a tunnel bow thruster is generally considered effective at low speed and when the ship’s motion through the water degrades its effect. • Make sure the statement does not exaggerate what a bow thruster can do in strong current or as a substitute for backing with the main engine.

🔍 Key Concepts

💭 Think About

✅ Before You Answer