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The Use of a Retractable Planing Flap Instead of a Fixed Step on a Seaplane

出版	National Advisory Committee for Aeronautics, 1943
URL	http://books.google.com.hk/books?id=Qh8jPwAACAAJ&hl=&source=gbs_api

註釋Data are presented and discussed to show the improvements in both the hydrodynamic and the aerodynamic performance of a seaplane that could be obtained if a retractable planing flap were used instead of the conventional main step. The improvements in resistance made possible by the use of a planing flap to vary the depth of step during and after take-off are of the order of 8 percent in the water resistance at the hump speed and about 2 or 3 percent in the total air drag of a long-range flying boat of current design at cruising attitude. One type of retractable flap that could be used is described and the results of hydrodynamic stability tests of a model fitted with the flap are given. The tests indicated that very good stability characteristics could be provided with the planing flap for take-off and landing.