Excerpt from Propellers

A brief treatment is given of methods for determining the power required to propel a ship at a given speed, together with data for various types of ships and boats. It is believed that intelligent use of this material will give satisfactory results under ordinary conditions, the best results, expecially under extreme conditions, can be expected only by experienced designers who have specific information.

All methods of designing ships and propellers are based, either explicitly or implicitly, on the theory of, mechanical similitude. The conclusions and methods of this theory may be stated brie¿y and used easily, a presentation of the theory is given at the end of the book for convenient reference.

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