Marine shafting alignment¹

Article type: Research Article

Authors: Yellowley, G. | Richards, J.E.

Note: [1] Paper read at the meeting of “The North-East Coast Institution of Engineers and Shipbuilders”, 12th March, 1954.

Abstract: Part I. A brief account is given, of a method in general use, of installing propeller shafting and setting an engine bedplate to align the crankshaft with propeller shafting. This is followed by a discussion of the events which led to the need for modification of the above procedure and goes on to describe a simple technique which enables alignment to be checked during a.Constructionb.Installation on board shipc.In service under loaded and light ship conditions. Alignment readings obtained during the above stages are given together with readings taken during the investigation of service difficulties in which malalignment has been suspected. Part 2. The results are given of calculations made by the staff of the British Shipbuilding Research Association of the variation in the loading of the shaft bearings in a 17,000 tons d.w. Diesel-engined tanker, with wear-down of the stern bush. The significance of the results are discussed with regard to such factors as the effect of propeller forces, the allowable wear-down of the stern bush and the possibility of lateral vibration of the shafting occurring in service. It is concluded that the aim in design should be to provide sufficient flexibility so that the bearing loads on the after plummer blocks do not change appreciably with wear down of the stern bush.

DOI: 10.3233/ISP-1955-21002

Journal: International Shipbuilding Progress, vol. 2, no. 10, pp. 258-274, 1955