Preface to the fourth edition

The changes in this edition, compared with the third edition, published in 2000, reflect the feed back received from those using the book. They include a general revision of the arrangement of the text and take account of the continuing advances in our knowledge in the field of naval architecture and the way naval architects approach their work. There is greater emphasis on the work of national and international regulatory organizations and of the classification societies. Safety and environmental pollution receive more attention in line with the growing public concerns in these matters and their impact upon ship design and operation, for instance, the double hull tankers. In the areas of manoeuvring, directional stability and vibration some of the mathematics has been replaced by a physical explanation of the phenomena concerned. The discussion on different ship types has been made broader reflecting the greater diversity of designs within any one ship type.

Although some maritime authorities still use the old units, SI units are now almost universal. Those who do not use them every day are generally familiar with them and for these reasons only SI units are used in the main text. To assist those who may wish to consult data in the old form conversion tables are given in an appendix. As a special case, and because of the importance of the early work in ship resistance, the reader is introduced to the Froude notation in another appendix.

It is hoped that these changes will make the book more suitable for those who need only a relatively simple introduction to naval architecture and will provide a better understanding for those students who do not find mathematical equations easy to interpret. In any case the mathematics cannot, in a book at this level, be rigorous. Even with advanced texts and research papers, simplifying assumptions are often necessary. For instance, problems are often treated as linear when, in reality, many aspects of a ship's behaviour are non-linear. The book should also help an experienced person refer quickly to the main factors to be considered in common situations.

As in so many areas of modern life the computer is becoming an ever more powerful tool. More has been said upon the part it plays in the x PREFACE TO THE FOURTH EDITION

design, production and operation of ships but it would be unrealistic to attempt any detailed discussion of the many programs available to the naval architect. These programs are changing rapidly and the student is referred to the regular CAD/CAM reviews and updates which appear in the journals of the learned societies. The use of spreadsheets for many of the repetitive calculations is illustrated. Solutions to the questions are available from the Elsevier website. Appendix E presents a range of questions based on each chapter of the book for use by students and lecturers, who may choose to set the questions as homework or self-study exercises. See Appendix E for further information.

References have been updated to help the reader follow up, in more detail, the latest developments in naval architecture. This aim of keeping up to date, however, is best achieved by joining one of the learned societies, which usually allow free, or much reduced cost, membership for students.

Recognizing the increasing amount of information becoming available on the Internet, the opportunity has been taken to include some useful web site addresses. As an example the web site for Elsevier Butterworth-Heinemann would be given as (http://books.elsevier.com). Many other useful sites can be gleaned from the technical press. The student is encouraged to use these sources of data but they need some fundamental knowledge of the subject before they can be used intelligently. It is hoped this book provides that understanding.

Dedicated to Will, George, Phoebe and Millie

How To Have A Perfect Boating Experience

How To Have A Perfect Boating Experience

Lets start by identifying what exactly certain boats are. Sometimes the terminology can get lost on beginners, so well look at some of the most common boats and what theyre called. These boats are exactly what the name implies. They are meant to be used for fishing. Most fishing boats are powered by outboard motors, and many also have a trolling motor mounted on the bow. Bass boats can be made of aluminium or fibreglass.

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