Question 4223Deck General70% to pass
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?
AI Explanation
The correct answer is D. Turning response by use of the rudder only is NOT greater than on a single-screw vessel.
The reasoning is that on a twin-screw vessel, the thrust from the two propellers counteracts each other, reducing the turning moment provided by the rudder. This makes the turning response less than on a single-screw vessel, where the thrust from the single propeller adds to the turning moment of the rudder.
The other options are correct statements about the behavior of a twin-screw vessel with a single rudder. A is correct because the ship will steer a fairly steady course with the rudder amidships. B is correct because the wake against the forward side of the rudder is the principal force that turns the ship. C is correct because if one screw is stopped, the ship will turn toward the side of the stopped screw.
Related Questions
#4221 A vessel is equipped with twin propellers, both turning outboard with the engines half ahead. If there is no wind or current and the rudders are amidships, what will happen? #4222 You are going ahead on twin engines with rudder amidships. Your starboard engine stalls. To continue on course, you should _______________.#4224 You are going ahead on twin engines with rudders amidships. Your port engine stalls. To continue your course you should _______________.#4225 You are operating a twin-screw vessel and lose your port engine. You continue to operate on your starboard engine only. Which action would you take to move your vessel ahead in a straight line? #4226 With rudders amidships and negligible wind, a twin-screw vessel moving astern with both engines backing will back _______________.