Excerpt from Hispano-Suiza Aeronautical Engines, Birkigt Patents: Instruction Book, September, 1918, Series No. 6h The remarkable progress that has taken place in the field of aviation during the past few years has been due largely to the rapid developments made in aero nautical engines. Most of the early aeroplanes were equipped with rotary engines. These engines had the. Advantage of being light in weight, but they lacked power and reliability. Moreover, they were uneconomical in oil and gasoline. It soon became apparent that any fur ther progress in aeronautical engines must necessarily come from developments along the lines of the more powerful stationary engines. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.
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