Excerpt from The Resistance and the Proportions of Screw Propellers

About four years ago the writer published a treatise on the Power and Speed of Steam Vessels, showing the method adopted for calculating the indicated horse power required for propelling vessels of different types at any desired speed, by means of Tables and Rules he had, some years previously, prepared for his own use.

The reason for preparing those Tables and Rules was, that in consequence of the great variation in the types of both vessels and engines which at that time had recently taken place, the formula that were sufficient for calculating the resistance of screw propellers when applied to one type of vessel, and driven by one type of engines, had practically become obsolete, or required to be supplemented by formula having a wider range, that should embrace the various types of both vessels and engines.

It will be observed, therefore, that in the treatise on the Power and Speed of Steam Vessels, provision is made for calculating the indicated horse-power required for vessels of different types, when propelled by engines also of different types.

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