NACA-TN-1248

Abstract

Force tests have been made in the Langley 4- by 6-foot vertical tunnel to determine the aerodynamic characteristics of an NACA 0009 tapered semispan wing equipped with a plain and a balanced flap having three different included angles at the trailing edge. <br>A comparison was made between lift and hinge-moment parameter values as calculated by existing methods from two-dimensional data and the comparison showed that the differences between the measured values of the lift and hinge-moment parameters and the values calculated from two-dimensional data by lifting-surface theory were, in general, no greater than the differences between the measured values for wings of the same aspect ratio but with different chord distributions. <br>The effects of overhang, gap, and trailing-edge angle on the lift and hinge-moment parameters were similar to the effects previously found in tests of two-dimensional models. Interference between bevel and overhang was indicated by the fact that the incremental effects of the overhang on the hinge-moment parameters varied as the trailing-edge angle was increased.