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The simplest of our flying machines is aerodynamically exceedingly complex.  We have always been prepared to design and build aircraft to meet extraordinarily severe conditions.  There is only one yardstick by which we can expect to be judged - results.  We need all our skill - and skill is art, though not the whole of it.

SIR WILLIAM S. FARREN

[[image - black & white photograph of propeller testing device]]
[[caption]] Whirling table device used in pioneering propeller research at Worcester Polytechnic Institute, 1911 [[/caption]]

[[image - black & white photograph of early wind tunnel]]
[[caption]] Early wind tunnel constructed and operated by the Institut Aerodynamique de Koutchino, near Moscow [[/caption]]

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