Turning in Shallow Water and High Wind

This page is being developed to collect comments and data concerning the problems associated with turning large vessels in shallow water and high winds.

A discussion document is being prepared that tries to draw together the issues involved in manoevring larger vessels, especially longer vessels with high side windage.
It is hoped to publish this shortly.
It will then be made available from this site.

The SIGTTO site will also have some further information soon.

Meanwhile the aim is to start collecting data so as to to get  better informed understanding of the issues that need to be addressed formally.


The following format should be used to collect data:

You can printout this page or download a blank Excel (.xls) spreadsheet (1 sheet A4, 16kb)

Ship's Name:
Callsign:
MMSI:
Date:
Time (UTC):



Length OA (m):
Lpp (m):
Beam (m):

Draught For'd
(m):
Draught Aft
(m):
Block Coefficient (Cb):


Wind Direction (from):
Wind Speed
(kts):
Lateral (side, above waterline) windage area (m2)
Current Direction (to):
Current rate
(kts):
End on (above waterline) windage area (m2)

Start Position:
 Latitude:
Longitude:

Water depth
(m):
Under Keel Clearance (m):

Initial Heading:

RPM  used
for Turn:


Initial Speed:


Ship's
Head
 Rate of
Turn
Course being made good
 Speed being made good
Point Time
 Position
 (°)
 (°/min)
 (°)
 (knots)
Start





1





2





3





4





5





6





7





8





9





10





11





12





13





14





15







Notes:

a. Position:    Please be as accurate as possible; for example -  if GPS is being used  then please record 3 decimal places if possible .
b. Wind:    Please record true wind direction and speed NOT relative
c. Current:    Please make best estimate of current
d. Under Keel Clearance:    Please record as accurately as possible
e. Block Coefficient:    Please ensure this is correct for draught

Any queries should be sent to  George Lang

Please send any data and /or comments to:

by email:
George Lang (george.lang@solent.ac.uk)

by fax:
44 (0)23 8087 5951

by mail:
George Lang (turning data)
c/o Nautical Institute
202 Lambeth Road
London
SE1 7LQ
United Kingdom

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page produced by George Lang

last update was on 1st January 2003