Practical Aviation: Understandable Presentation of Interesting and Essential Facts in Aeronautical Science (Classic Reprint) - Softcover

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Excerpt from Practical Aviation: Understandable Presentation of Interesting and Essential Facts in Aeronautical Science

Early Attempts. Leonardo da mci 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.

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