Practical Aeronautics: An Understandable Presentation of Interesting and Essential Facts in Aeronautical Science (Classic Reprint) - Hardcover

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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 flight. 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 flying ship the appearance of which was somewhat like that shown in Fig. I, by exhausting the air from metal spheres fastened to a boat.

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