Year: 199? Language: english Author: Alfred Carver Publisher: Fairplay Publications Edition: 1st ISBN: 1 870093 65 8 Format: PDF Quality: OCR without errors Pages count: 108 Description: Ships and boats are lost for many reasons. They may capsize during heavy rolling, or they may be overwhelmed by heavy, particularly following, seas. Invariably there are many factors contributory to any one loss. Human error looms large, as does stability, or the lack of it, or the lack of understanding of it. Small vessels present the designer and operator with more varied and more difficult stability problems than do large ships. This is because the sea conditions they endure are more severe in relation to their size, and also because the moveable weights of fish, cargo, ice, fuel, etc, are larger in comparison to the vessel’s displacement. And a small vessel is more likely to be operated by a skipper who is directly involved with the economics of the venture, and who may therefore be inclined to work the vessel harder, perhaps too hard. The way stability works is the same for small or large vessels, whether fishing or trading. In all cases, the vessel’s ability to return to the upright after being heeled by an external force determines her stability. This ability is dependent on the height of her centre of gravity, her upright freeboard, and her ability to keep the water out. These factors are under the skipper’s direct control, since he decides how much weight is to be allowed on board, where it is to be stowed, and how the vessel’s watertight closing appliances are operated. It is not unknown for fishing vessels to be loaded until the deck is actually awash, and it is hard to believe that a skipper permitting such a situation has any appreciation at all of the effect on his vessel’s stability. This book has been prepared by a seaman and fisherman, for seamen and fishermen. It puts the concepts of ship stability, which are not difficult, into seaman’s language. It is directed primarily at the operators of small vessels, but the descriptive treatment may also be found to be useful background material for those going on to study the subject more deeply. The terms “boat”, “vessel”, and “ship” are used more or less interchangeably. “Skipper” is normally used, but trading people can think “Master” whenever it occurs. The Tamar stability book in the Appendix is based on one compiled by Rob Lovell at the Australian Maritime College, and is used for statutory examinations. Some of the material first appeared in the journal Professional Fisherman, and permission from Baird Publications, Melbourne, Australia, to reproduce it is gratefully acknowledged. I am grateful to Ms Carol Scott for drawing the pictures, and to the Australian Maritime College for assistance with word processing.
Вы не можете начинать темы Вы не можете отвечать на сообщения Вы не можете редактировать свои сообщения Вы не можете удалять свои сообщения Вы не можете голосовать в опросах Вы не можете прикреплять файлы к сообщениям Вы не можете скачивать файлы
Simple Ship Stability
Language: english
Author: Alfred Carver
Publisher: Fairplay Publications
Edition: 1st
ISBN: 1 870093 65 8
Format: PDF
Quality: OCR without errors
Pages count: 108
Description: Ships and boats are lost for many reasons. They may capsize during heavy rolling, or they may be overwhelmed by
heavy, particularly following, seas. Invariably there are many factors contributory to any one loss. Human error
looms large, as does stability, or the lack of it, or the lack of understanding of it.
Small vessels present the designer and operator with more varied and more difficult stability problems than do large
ships. This is because the sea conditions they endure are more severe in relation to their size, and also because the
moveable weights of fish, cargo, ice, fuel, etc, are larger in comparison to the vessel’s displacement. And a small
vessel is more likely to be operated by a skipper who is directly involved with the economics of the venture, and
who may therefore be inclined to work the vessel harder, perhaps too hard.
The way stability works is the same for small or large vessels, whether fishing or trading. In all cases, the vessel’s
ability to return to the upright after being heeled by an external force determines her stability. This ability is
dependent on the height of her centre of gravity, her upright freeboard, and her ability to keep the water out. These
factors are under the skipper’s direct control, since he decides how much weight is to be allowed on board, where it
is to be stowed, and how the vessel’s watertight closing appliances are operated. It is not unknown for fishing
vessels to be loaded until the deck is actually awash, and it is hard to believe that a skipper permitting such a
situation has any appreciation at all of the effect on his vessel’s stability.
This book has been prepared by a seaman and fisherman, for seamen and fishermen. It puts the concepts of ship
stability, which are not difficult, into seaman’s language. It is directed primarily at the operators of small vessels, but
the descriptive treatment may also be found to be useful background material for those going on to study the subject
more deeply. The terms “boat”, “vessel”, and “ship” are used more or less interchangeably. “Skipper” is normally
used, but trading people can think “Master” whenever it occurs.
The Tamar stability book in the Appendix is based on one compiled by Rob Lovell at the Australian Maritime
College, and is used for statutory examinations.
Some of the material first appeared in the journal Professional Fisherman, and permission from Baird Publications,
Melbourne, Australia, to reproduce it is gratefully acknowledged.
I am grateful to Ms Carol Scott for drawing the pictures, and to the Australian Maritime College for assistance with
word processing.
Contents
Screenshots
hidden
Скачать [12 KB]
Поделиться
Поделиться
your reputation is 0 and you need 5
ore in ratio you need 1 and yours is 0.01 and going down
Поделиться