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Published Date

January 1982

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Drift Characteristics of 50,000 to 70,000 DWT Tankers

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This publication provides drift characteristics of tankers from 50,000 to 70,000 dwt.

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This publication is based on the results of a study carried out by the National Maritime Institution (NMI), in conjunction with OCIMF, to investigate the drift characteristics of tankers from 50,000 to 70,000 dwt. It contains:

-          an overview of the study

-          details of the model experiments carried out

-          predictions of drift

-          a general discussion of the study and the conclusions drawn from it.


An Appendix is included that contains plotting and tables taken directly from the experimental results of the study.

1. Introduction


2. Conduct of the Study


3. Model Experiments


4. Validation of Computer Prediction


5. Predictions of Drift


6. General Discussion


7. Conclusion


8. References


9. Nomenclature




Following investigations into drift characteristics, it was discovered that results obtained for VLCCs were not necessarily indicative of the behaviour of smaller vessels. Concern was expressed by the American Institute of Merchant Shipping (AIMS) for the need to include within the scope of the studies details for vessels of the 50,000 to 70,000 dwt range, particularly in view of the present numbers of these ships.


Computer programs were developed by the National Maritime Institute (NMI) to assess drift behaviour of these ships, which required validation. Some free model experiments were carried out to investigate wave drift forces and also to determine the accuracy of results obtained.


The Oil Companies International Marine Forum (OCIMF) and the NMI worked together upon the project to estimate the effects of wind, waves and current upon the drift track, heading and speed of such vessels under a variety of conditions.


The Appendix to the study contains some 28 of the 72 runs, being representative of the whole series or effects obtained. The raw data on the experiments may be obtained from:

The National Maritime Institute,


Middlesex, TW14 0LQ,


The Oil Companies International Marine Forum (OCIMF) is a voluntary association of oil companies with an interest in the shipment and terminalling of crude oil, oil products, petrochemicals and gas. OCIMF focuses exclusively on preventing harm to people and the environment by promoting best practice in the design, construction and operation of tankers, barges and offshore vessels and their interfaces with terminals. Learn more at

Title: Drift Characteristics of 50,000 to 70,000 DWT Tankers
Number of Pages: 100
Product Code: 4400W010
ISBN: ISBN 13: 978-0-900886-67-6 (9780900886676), ISBN 10: 0-900886-67-6 (0900886676)
Published Date: January 1982
Binding Format: Paperback
Book Height: 290 mm
Book Width: 205 mm
Book Spine: 7 mm
Weight: 0.40 kg
Author: Oil Companies International Marine Forum

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