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Shallow Water Effects

As the bull moves through shallow water, that which it displaces is not so easily replaced by other water, and the propeller and rudder are working in what might again be loosely termed a partial vacuum. The vessel takes longer to answer her helm, and response to engine movements becomes sluggish. In these circumstances vibration will […]

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Stranding And Beaching

When a  vessel is  grounded  intentionally  she  is  said  to  be beached. If she is grounded accidentally she is stranded. A vessel is usually beached when she is damaged to such an extent that the pumps are unable to cope with the rate of flooding. There is therefore always an interval of time, however short, […]

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Turning a Vessel Short Round

The vessel is turned round in bet own length. No headway or stern­ way is gathered. When the engine is reversed a powerful swing to starboard is generated, and so these ships are always swung to starboard, unless they have small high-speed propellers, when transverse thrust is small. In (1) the engine is worked full […]

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Berthing with wind astern

The procedure is similar to that of Fig.47 (berthing with port anchor), except that the vessel must be canted slightly away from the berth in (2) to allow for the onshore swing generated by the astern transverse thrust. The offshore cant must not be excessive, for prolonged utero movement to correct this may cause the […]

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Berthing in a Current

This method applies whichever side-to the ship is berthing. The current should always be stemmed, and there is then no danger of overrunning the berth. The ship is rounded to under slow headway with perfect control. The stream will be setting the ship down during the approach and for this reason the ship can well […]

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Pivot Point

STOPPED Unless stated otherwise, each example assumes a ship on even keel in calm conditions and still water. In this situation no forces are involved and the ship has its centre of gravity, approximately amidships.   Pivot point – stopped   HEADWAY Two forces now come into play. Firstly, the forward momentum of the ship […]

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