ion length and is cosh merely a geometrical scale factor. In the following 2a cos 0 theory, attention is directed to the fact that the shape of the curve resulting from transformation (I) is arbi- sinh —-.—7. r 2a sin 9 trary, since the airfoil shape is arbitrary. At a later point we shall… … \2a cosh \pj \2a sinh ty) Figure 1.—Showing the transformation from a noncircular curve B into an airfoil. from the origin z'—.that is, both flows are similar ! or developed at infinity. In particular, the "angle of attack," j 2 sinh2 f = -p + tJp2 + (|J (IV) defined as the direction of flow at…
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