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Manœuvring Large Ships in Shallow Water—I

Published online by Cambridge University Press:  18 January 2010

J. P. Hooft
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Dr. J. P. Hooft who is a Vice-President of the Netherlands Ship Model Basin at Wageningen, discusses the hydrodynamic forces which act upon a large ship sailing in shallow water. Their effects on the manœuvrability and control of the ship include a smaller response to a given rudder angle, a shift of the pivoting point aft towards the centre of gravity, a larger turning circle and less reduction in speed when turning. In general a ship becomes more sluggish in shallow water.

Since manœuvres with large ships are usually only performed in the proximity of harbours while in deep water the ship is kept on course by means of an autopilot, it will be difficult to compare the manœuvrability of large ships in shallow water with their manœuvrability in deep water. The influence of water depth on the hydrodynamic characteristics of the ship will therefore be the main subject of the present paper; the consequences of these ship characteristics on manœuvrability will then be considered. This term ‘manœuvrability’ is often replaced by ‘controllability’. In this respect a ship is said to be controllable when the navigator is able to manœuvre the ship with ease in such a way that departures from the anticipated manœuvre remain within acceptable limits.

Type
Research Article
Information
The Journal of Navigation , Volume 26 , Issue 2 , April 1973 , pp. 189 - 201
Copyright
Copyright © The Royal Institute of Navigation 1973

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References

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