Excerpt from Practical Aeronautics: An Understandable Presentation of Interesting and Essential Facts in Aeronautical Science Early Attempts. Leonardo da Vinci devoted some time to the problem of artificial ight. His sketches show the details of bat like wings which were to spread out on the downward stroke and fold up with the upward stroke. Francisco de Lana planned to make a ying ship the appearance of which was somewhat like that shown in Fig. I, by exhausting the air from metal spheres fastened to a boat. About the ...
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Excerpt from Practical Aeronautics: An Understandable Presentation of Interesting and Essential Facts in Aeronautical Science Early Attempts. Leonardo da Vinci devoted some time to the problem of artificial ight. His sketches show the details of bat like wings which were to spread out on the downward stroke and fold up with the upward stroke. Francisco de Lana planned to make a ying ship the appearance of which was somewhat like that shown in Fig. I, by exhausting the air from metal spheres fastened to a boat. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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