A twin-screw vessel with a single rudder is...

Question 1 / 2707066636ee728f7522a1c518d48

Question 1 of 2707066636ee728f7522a1c518d48

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE?

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Question 1 of 27070

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE?

🔍 Key Concepts

• Transverse thrust and propeller side forces on twin-screw vessels • How rudder force is created by water flow (propeller race vs. general headway flow) • The difference in maneuverability between twin-screw and single-screw ships

💭 Think About

• Think about what actually makes a rudder effective: is the main turning force coming from water pushed by the propellers, or from general water flow along the hull? • On a twin-screw ship, what happens if one engine is stopped while the other keeps going ahead at full speed? Which way will the ship tend to swing? • Compare how easily a twin-screw vessel can be turned using just the rudder versus using differential engine control. Which statement might be overstating rudder-only performance?

✅ Before You Answer

• For each option, ask: does this match real twin‑screw handling behavior with engines full ahead and no wind/current? • Visualize the flow of water over the rudder when both screws are turning ahead versus when one is stopped. • Be sure that the FALSE statement is inconsistent with how rudder forces or twin‑screw handling actually work, even if it sounds plausible.

Question 1 of 27070

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE?

With the rudder amidships, the ship will steer a fairly steady course.

The principal force which turns the ship is set up by the wake against the forward side of the rudder.

If one screw is stopped, the ship will turn toward the side of the stopped screw.

Turning response by use of the rudder only is greater than on a single-screw vessel.

Question 1 / 2707066636ee728f7522a1c518d48

Question 1 of 2707066636ee728f7522a1c518d48

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE?

Back

Question 1 of 27070

A twin-screw vessel with a single rudder is making headway. The engines are full speed ahead. There is no wind or current. Which statement is FALSE?