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Third edition, rewritten. Discarding all of the design curves as set forth in the preceding edition, and retaining only the well authenticated points, equations for the curves passing through these points were found and the complete curves laid down by the aid of these equations. The most striking effect produced by this change was in the curves for basic apparent slip. In the second edition, these basic slips were based upon the hulls of the ships and the projected area ratios of the propellers. In the new edition, they are based upon the hull of the ship and the ratio of the length of after body of the vessel to its draft or height of stream line body. In the new edition, much more attention has been given to variations in hull form, and these variations of hulls have been separated into types according to the general character of the lines. After classifying the ships, the peculiar effect of each type on propeller performance has been studied. Contents include: types of hull ; estimation of power ; early estimations for obtaining data for the design of screw propellers ; theoretical treatment of the screw propeller ; practical methods of design ; design based on actual trials of full-sized propellers in service over carefully measured; cavitation ; design of the propeller ; change of pitch from designed pitch ; stopping, backing and turning of ships; computation for strength, friction, centrifugal force; propellers for airplane and dirigibles.

Lloyd’s Register introduces guidance to assist with the safer management of asbestos in ships (March 2013) Asbestos remains a problem in shipping. Despite better management and reduced production of asbestos, there remains considerable room for improvement, primarily to reduce the number of deaths. It is still estimated that more than 107,000 people die each year from mesothelioma, lung cancer and asbestosis – the three major asbestos-related diseases – as a result of occupational exposure. The report’s author, Robin Townsend, Lloyd's Register’s Regulatory Affairs Lead Specialist, says: “Far from being a problem of the past, asbestos is still produced in many countries and is still widely used, and it is present in many existing buildings and structures, including ships. Most countries still do not have effective prohibitions and global production is still over 40% of peak values. It is imperative that we see further and substantial improvements in regulatory enforcement and a reduction in asbestos related mortality.” The guide takes a wider look at asbestos, exploring its history, composition and health effects to underline the vital importance of correct management. It also details asbestos-related regulation and suggests tools that can be used to achieve best practice in asbestos management. Ships often have an increased risk of asbestos exposure. The use of asbestos in shipbuilding has been unusually high over the years and some of the most dangerous asbestos application methods have been particularly prevalent in ship construction. A UK study estimated a 61% increased incidence of asbestos related illness in shipyard workers. A similar study in Trieste, Italy, showed that of 153 men who had died of malignant mesothelioma 99 had worked in shipbuilding 19 had been in the navy/merchant marine and 7 had been dockworkers. “What is vital is that we continue to guard against the risks that asbestos presents within the maritime industry, and we very much hope this publication will further in this aim,” added Robin.

In order to extend lives of ageing ships it is necessary to make a study on feasibility for extending their planned life. In this paper studies on fatigue strength for hull structure with mild and high tensile steels and maintenance procedures for good protection from corrosion are briefly reviewed. Some discussions are made to procedures and analytical techniques of an assessment for life extension of ageing ships.

A description is given of the development of a fast monohull hull form for commercial applications and its adaptation to a class of fast naval logistics ships and fast combatants. For commercial applications two fast Ro-Pax ships a fast cargo ship and a fast crew boat are included. For naval applications a large fast naval sea-lift ship and a smaller inter-theatre logistics vessel are described along with two combatant variants - a small fast attack craft and a larger fast surface combat ship.

A brief review is given of the growth of the use of oil as a fuel for merchant ships. This paper identifies a number of alternative energy sources and examines their application in the marine environment. Introduction of any alternative fuel will ultimately be determined by the development of an international supply infrastructure which in turn will have a lead time measured in years.

Discussion is presented of an environmental audit and assist process for ships which has been successfully implemented within Maritime Forces Pacific (MARPAC) Canada's navy in the Pacific. Topics covered are: the definition of environmental auditing; the decision process that led to the selection of environmental auditing as the cornerstone of MARPAC's environmental program; how MARPAC's audit programme was developed; and the audit process itself including lessons learned. The program has produced tangible results with a great deal of progress made in just one year. Ship environmental auditing should be considered by any organization serious about addressing environmental risk and compliance issues in their maritime operations.

An advanced safe ship technology is needed to contribute to design operation inspection and maintenance of ships for the expected life span. This technology is a synthetic system simultaneously taking into account all factors relevant to the ship's safety. The development of such a system (called 'ClassNK ADASS') has been studied and 35 WBTs of 22 existing ships aged 4 to 20 years have been investigated. The tendency of ageing deterioration of tar-epoxy (TE) coating in a WBT leading to coating deterioration in a short term and the proposed WBT protection system is detailed.