Wind-Tunnel Investigation of Control-Surface Characteristics, Vol. 19

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Excerpt from Wind-Tunnel Investigation of Control-Surface Characteristics, Vol. 19: A Double Flap With an Overhang and an Internal Aerodynamic BalanceThe tests were made in the Naca y 6~foot vertical tunnel (reference 2) modified as discussed in reference 5. The 2-foot-chord by h-foot-span model was made of lami hated mahogany, except for the front flap which was steel. The airfoil conformed to the naca 66-009 airfoil contour forward of the forward-flap hinge axis and to a straight line contour behind this hinge axis. The model was pro vided with a forward flap and a 0.2oc rearward flap. Figure 1 shows the me.hod used to connect the flaps to each other and to the airfoil. He rearward flan was connected to the forward flap by a mechanism that allowed he rearward flap to deflect one, two, or three times as fast as the forward flan, that is, doz/ddl equals either 1, 2, or 5. Mhe forward flap was orovided with three interchangeable blunt-nose overhang balances and three interchangeable internal balances having chords 25, to, and 50 percent of the forward-flan chord. The arrangements tested and pertinent model dimensions are shown in figure 2.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.