Excerpt from Air Forces on Circular Cylinders, Axes Normal to the Wind, With Special Reference to Dynamical Similarity For lack of anything better, the still-air resistance equation has often been used to pass from model experiments made m a wind tunnel to the full-scale body moving into free still air. It can not be expected a priori that computations made ln this way will give accurate results, because the conditions 111 the confined and some What turbulent air stream in the tunnel are not the same as those for Which the equation Was deduced; and, in fact, we know by experiment that the results of such computation are not very satisfactory. We have, therefore, to reconsider the problem and deduce the equation for this more general case. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.