Synopsis

The paper entitled "The Size and Speed of Tankers and Recent Improvements in Construction" deals with the importance of tankers in the Shipping Industry, the factors which, from the Owner's point of view, make for efficiency, and the relationship of economy and tanker design and equipment. The paper also discusses the incentives to build larger tankers and the factors which limit the size of such ships. Size in relation to strength is also dealt with without becoming too involved in technicalities, while a comparison is made between rivetted and welded construction. The speed of tankers recently built and now being built is referred to and the factors which should be considered when determining the most economical speed of a proposed ship are given.

Résumé

La communication intitulée: "Dimensions et Vitesse des Tankers et les derniers perfectionnements apportés à leur construction" traite de l'importance des tankers dans la navigation, des facteurs qui, du point de vue du propriétaire, contribuent au bon rendement et du rapport entre l'économie et la construction et l'armement des tankers. La communication discute les motifs incitant à construire des ta%kers plus grands ainsi que les facteurs qui en limitent les dimensions. I1 y est également question des dimensions en fonction de la force de résistance sans qu'on ait trop insisté sur les détails techniques, et on y établit une comparaison entre la construc- * O. B.E., M. I. Mech. E., Manager of the Marine Research and Development Department of the Anglo-Saxon Petroleum Company, Ltd., London. ** M.I. N. A., Naval Architect of the Marine Research and Development Department of the Anglo-Saxon Petroleum Company, Ltd., London. tion rivée et la construction soudée. Mention est faite de la vitesse que peuvent déployer les tankers récemment construits et en voie de construction ainsi que des éléments à prendre en considération pour déterminer la vitesse la plus économique d'un navire donné.

Introduction

Never before have there been so many bulk oil carrying ships under construction, and in view of the constantly increasing application of petroleum and its many and varied products it is safe to say that this class of ship will form a larger proportion of the worlds future shipbuilding than has been the case hitherto, particularly as the average useful life of an oil tanker is considerably less than that of a dry cargo carrier.

To illustrate the phenomenal growth of the world's oil tanker fleet during the past twenty years the number of shi s built or on order in January of 1,000 tons deadweight and under have not been included but it can be assumed that in the period reviewed there has been a great tonnage increase in this class of oil tanker also. the years 1930 an d 1950 is given below. Tankers of Number of tankers Deadweight t

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