Abstract
THIS paper, running to some forty-seven pages A of closely printed matter, is a book in itself. It is illustrated by twenty-seven figures, and is in five parts; Part I deals with resistance due to skin-friction, on an empirical basis, the determinations of Froude and of the many workers who followed him being presented in the form of a logarithmic diagram, in which, as is usual, drdinates give values of the constant C0 (as in the expression jR = C0pF2 x 2a) and abscissae give Reynolds' numbers from 102 to 1010; these numbers, denoted by the symbol NR, cover the whole range from that proper to laminar flow, to that which obtains for ocean-going liners. The author points out that it is not possible to reconcile the wide variations in known data and gives a graph as indicating the probable minimum under ordinary average conditions. After a general discussion, an example is taken in the Graf Zeppelin; the hull resistance is calculated on the basis suggested by Froude in the case of ships; the horse-power is deduced for a flight speed of 80” m.p.h. and is in approximate agreement with that declared. A second example is given.
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The Part played by Skin-Friction in Aeronautics. Nature 138, 1022–1023 (1936). https://doi.org/10.1038/1381022b0
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DOI: https://doi.org/10.1038/1381022b0