An experimental investigation of the subsonic longitudinal characteristics of five slender-wing models with gothic planforms

Abstract

The lift, drag and pitching moment on five symmetrical slender-wing models with sharp edges and aspect ratios of 1.28 and 1.46 have been measured at low subsonic speed. Four of the models had a gothic planform and one a mild gothic planform. Variations in thickness distributions were covered by the range of models and the tests included a modification of one of the models to reduce the lift-dependent drag. These tests extended earlier work on slender wings to higher aspect ratios and the results have been analysed to show how the lift, drag and longitudinal stability of wings in this higher range of aspect ratio are affected by planform shape and by the chordwise and spanwise distribution of wing thickness.