Excerpt from PropellersA 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.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.