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Excerpt from Formulas for Propellers in Yaw and Charts of the Side-Force Derivative The equations, and the charts computed irom the equa tions, are based on an unpublished analysis, which incor porates factors not adequately covered in previously pub lished work and gives good agreement with experiment over a wide range of Operating conditions. A study of the equations indicates that they are consistent with the fol lowing physical interpretation: In developing side force, the propeller acts like a fin of which the area is the projected side area of the propeller, the effective aspect ratio is of the order of 8, and the effective dynamic pressure is roughly that at the propeller disk as augmenhfii by the inflow. The variation of the inflow velocity, for a fixed - pitch propeller, accounts for most of the varia tion of side force with advance - diameter ratio, The charts may be applied to obtain the rate of change of normal - force coefficient with angle of attack of the axis of rotation if proper account is taken of the upwash or downwash from the wing. 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.

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