File:Annual report of the Board of Regents of the Smithsonian Institution (1919) (14778252051).jpg

Identifier: annualreportofbo1919smithso (find matches)
Title: Annual report of the Board of Regents of the Smithsonian Institution
Year: 1846 (1840s)
Authors: Smithsonian Institution. Board of Regents United States National Museum. Report of the U.S. National Museum Smithsonian Institution. Report of the Secretary
Subjects: Smithsonian Institution Smithsonian Institution. Archives Discoveries in science
Publisher: Washington : Smithsonian Institution
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ficient in that itused only the lower and less important surface of the plane to obtainthe lift. Few people seem to realize that it is the upper and not thelower face of the plane, say of an aeroplane, that does most of thework. The results made public recently by the British AdvisoryCommittee on Aeronautics show that never, even with simple flatplanes, does the air impinging on the lower surface exert more than aquarter of the total lift. It is the camber of the upper surface, overwhich a partial vacuum is created, that is the important factor. Whatis true of one medium is more or less true of another and, therefore,it would seem that a boat depending solely on the lifting effect of thewater impinging on the sloping bottom is not the ultimate solutionto the problem of obtaining speed on the water. The steel planes of the HD-4 are cambered according to the re-sults of countless experiments, in order to take advantage of thelifting possibilities of both surfaces. The ratio of lift over
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Smithsonian Report, 1919.—Nutting. Plate 3.

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