International Shipbuilding Progress

Model tests have been executed to determine the bending and torsional vibration phenomena in the rudderpost of a “Mariner” rudder.

Discussion of the laws of mechanical similarity which must be satisfied in these model tests.

It appears from the measurements of the tension amplitudes that the excitation of the rudder by the helicoidal tip vortices of the propeller is not exactly harmonic but that it also contains a “noise” element.

The added mass of the rudder could be established from the measurements.

In this paper the author has not attempted to describe all the processes in the manufacture of a diesel engine: the scope is too wide. It has been necessary to confine the observations to general lines and to emphasize only those principles which appear to open up possibilities of progress and improvement in technique.

A good deal of attention is paid to the mechanization of fabrication and the combining of heavy machine tools for their special application to the problem of machining the large components for direct-drive diesel engines.

In view of the prime importance of machining processes in the production of marine engines, a large proportion of the paper deals with machine tools. While most of this plant would have a general application in any branch of heavy engineering, its particular suitability for marine engineering is emphasized.