Wind-Tunnel Investigation of Control-Surface Characteristics, Vol. 20

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Excerpt from Wind-Tunnel Investigation of Control-Surface Characteristics, Vol. 20: Plain and Balanced Flaps on an Naca 0009 Rectangular Semispan Tail SurfaceThe test results indicated that the slope of the lift curve was affected little by the amount of overhang and the balance nose shape but was increased by sealing the gap at the flap nose. At zero angle of attack, the variation of lift with flap deflection for the sealed-gap condition was the same as or slightly greater than for the unsealed-gap condition. The change in the hinge moment coefficient with angle of attack or with flap deflection generally was made more negative with sealing the gap. The effectiveness of the balancing tab in reducing the flap hinge-moment coefficients was approxi mately the same for both the sealed plain flap and the unsealed 35-percent-f1ap - chord elliptical overhang, also, the variation of lift coefficient with tab deflection was about equal for the plain flap and for the flap with aero dynamic balance.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis 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.