Scribd
Upload
85 views9 pages

Ship Stopping Procedures 1

The document discusses various measures of a ship's manoeuvrability including turning circle, advance, tactical diameter and transfer. It describes how these measures are affected by ship size, wind, current and the ship's parameters. It also discusses different procedures for stopping a ship such as hard turn, rudder cycling and stopping in narrow waterways. Comparisons are made between stopping distances using different procedures based on computer simulations.

Uploaded by

inder
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
85 views9 pages

Ship Stopping Procedures 1

The document discusses various measures of a ship's manoeuvrability including turning circle, advance, tactical diameter and transfer. It describes how these measures are affected by ship size, wind, current and the ship's parameters. It also discusses different procedures for stopping a ship such as hard turn, rudder cycling and stopping in narrow waterways. Comparisons are made between stopping distances using different procedures based on computer simulations.

Uploaded by

inder
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 9

Home Maps Resources Help Contact Us

Measures and Criteria


of Manoeuvrability
Turning Circle

Advance, transfer and tactical diameter

Advance – distance until 90° change of heading.


Tactical diameter – 180° change of heading.
Transfer – 90° change of heading as additional measure of some
interest.
The advance, the tactical diameter, and the transfer are given as
multiplicity of ship’s length.

IMO standards for Deep water:

Tactical diameter must be less than 5L


Advance must be less than 4.5L

Effect of Ship’s Size on Turning


Performance

Turning performance

Turning characteristics depend on the ship size.

The tactical diameter is not proportional to the displacement of the


ship, but relative tactical diameter D/L is equal for ships of different
sizes but geometrically similar.
Effect of Wind and Current on
Turning Circle

Turning trajectory

Effect of Ship’s Parameters on


Turning and Course Keeping
Normally in calm water a fully loaded ship at speed about 5 knots with a
rudder hard over (35 deg) will turn round 180 degrees in less than 4
ship’s lengths. With a smaller rudder angle the ship will make larger
turning circle and gain more speed.
How ship's parameters affect turning and course keeping

Swept Path
Performing a turning manoeuvre the ship requires some free space.
This space is larger than the turning circle, because at each point of the
turning circle the ship is positioned at certain angle (drift angle) to the
tangent to the path of the centre of gravity (CG).
Swept path

Ways to Stop the Ship

Apart from inertia stopping and crash stop there are also other
possibilities to stop the ship, such as:

Hard turn
Rudder cycling
Tactics called Stopping in narrow waterway
The principal reason for introducing the above strategies is desire to
shorten the stopping distance by judicious use of the hull and rudder
braking forces while maintaining the ship’s controllability .

Rudder cycling procedure

How to stop the ship using rudder cycling

Stopping in narrow waterway


How to stop the ship in narrow waters

Comparison of Different Stopping


Procedures
The stopping distances were estimated by computer simulation for a bulk
carrier 32 000 DWT

© 2017 ShipsNow.com Back to Top

This website uses 3rd party cookies to show relevant ads and track page visits. By
continuing to use the website we will assume you're happy to receive all cookies.

You might also like