Ship Manoeuvring, Handling. Test 20

Your ship is equipped with a single right-handed fixed propeller. While steaming full ahead you reverse the engine to stop the ship. How will the ship react?

You will sheer to port and stop rather quickly.
You will continue on a straight course.
You will sheer to starboard and gradually lose headway.
You will stop in 1.5 times the ship's length.

When a conventional rudder is put hard over it creates a lift force and a drag force. When the ship has to turn, how much lift force remains if the rudder-angle is decreased to 20 degrees from the hard over position?

About 30%.
About 80%.
About 50%.
About 10%.

Does a ship's trim influence her steering abilities?

No, it is usually best to have no trim at all.
Yes, a ship usually steers better if trimmed by the stern.
No, a ship will have the same steering ability unaffected by trim.
Yes, a ship usually steers better if trimmed by the bow.

How is shallow water effect felt by a vessel?

The vessel has a tendency to turn to port (for a right turning propeller).
The vessel has a tendency to turn to starboard (for a left turning propeller).
The vessel responds very quickly to the rudder.
The vessel becomes sluggish in responding to the rudder.

The maximum rudder angle on your ship is 35 degrees. Is the rudder most effective at this angle? Choose the most complete answer.

Yes, the rudder is most effective at maximum angle, because water flow over the rudder is strongest.
No, the rudder is most effective at small rudder angles, because drag is minimised.
No, the rudder angle is most effective at angles between 10 and 20 degrees, because water flow over the rudder is strongest.
No, the most effective rudder angle is about 25 to 30 degrees, because the rudder is 'stalling' at 35 degrees angle.

You are meeting another ship in confined waters. What can happen as the ships approach each other?

There will be no effect.
Initially the bows of the ships will be pushed away from each other.
Initially the bows of the ships will be pulled together.
Both vessels will be affected by squat.

You are transiting a narrow channel. What can happen in this situation?

The bow could be pulled towards the bank.
The stern could be pulled towards the river bank.
The bow could be pushed away from the bank.
The stern could be pushed away from the bank.

Review Answers

Ship Manoeuvring, Handling. Test 20

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