Abstract
INTRODUCTION mANY YEARS OF EXTENSIVE THEORETICAL WORK PROduced a simple theory that satisfactorily explains the lifting characteristics of wings of conventional aspect ratio acting in an incompressible fluid. On the other hand, only a rather complex theory is available at present for low aspect ratio wings. The solution of such a theory for routine engineering problems is considered far too time-consuming for ordinary needs. In addition to wings in the ordinary sense, there are at least two other types of lifting surfaces of general interest. They are the planing surface and the yawed hull of a displacement vessel. Both of these lifting surfaces are almost invariably of low aspect ratio, and both operate in an incompressible fluid. From time to time the need arises for estimating the lift characteristics of such bodies without entering into elaborate calculations. Since no simple theory is available, a correlation of available data on the lifting characteristics of low aspect ratio surfaces operating under various conditions was attempted.
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