Accession Number : ADA298176

Title :   Pressure Distribution Over an Airfoil Section with a Flap and Tab,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC

Personal Author(s) : Wenzinger, Carl J.

PDF Url : ADA298176

Report Date : 1936

Pagination or Media Count : 16

Abstract : Pressure-distribution tests of a Clark Y airfoil with a flap and an inset tab wer made in the N. A. C. A. 7- by 10-foot wind tunnel. The pressures were measured on both the upper and lower surfaces at one chord section. Calculations were made of the normal-force and pitching-moment coefficients of the airfoil section with flap and tab, the normal-force and hinge-moment coefficients of the flap section with tab, and the normal-force and hinge-moment coefficients of the tab section alone. In addition, comparisons were made of the theoretical and experimental values for an airfoil with a multiply hinged flap system. It was found that peak values of the increments of resultant pressures due to flap or to tab deflection occurred at the flap and tab hinges, respectively. Also, the variations of increments of airfoil section normal-force and pitching-moment coefficients and of flap normal-force and hinge-moment coefficients, due to flap deflection with a given tab setting, were practically independent of the tab deflection. In addition, the variation of increments of tab normal-force and hinge-moment coefficients with tab deflection for a given flap setting was practically independent of flap deflection. Comparisons of the theoretical with the experimental forces and moments for the airfoil section with-flap and tab show that the theory agrees fairly well with experiment for small flap deflections with the tab neutral, but that the theory indicates much greater effects than are actually obtained when the flap and tab are simultaneously deflected. (KAR) P.5

Descriptors :   *AIRFOILS, *PRESSURE DISTRIBUTION, SETTING(ADJUSTING), PEAK VALUES, DEFLECTION, MOMENTS, COEFFICIENTS, FLAPS(CONTROL SURFACES), HINGES, JET TABS.

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE