Abstract
THE source of energy used by birds in soaring flight is not yet clearly known. Attempts have been made to achieve this form of flight artificially, and, according to Gustav Lilienthal, a flight of 500 metres up wind, in which a height of 40 metres was attained, has been made by a man-carrying glider not provided with a motor, but having wings constructed on the pattern of those of a soaring bird.
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The Problem of Soaring Flight2. Nature 106, 518 (1920). https://doi.org/10.1038/106518b0
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DOI: https://doi.org/10.1038/106518b0