NACA-RM-A52L16

Abstract

INTRODUCTION <br>The low-speed aerodynamic characteristics of triangular-wing airplane models having wings of aspect ratios. 2, 3, and 4 have been under investigation in the Ames k-O- by &-foot wind tunnel, and results have been reported in references l, 2, and 3: Interest has been expressed in the aerodynamic characteristics of these wings when the plan form was modified by the removal of the pointed tips. As a result of this interest, tests were carried out on the aspect ratios 3 and 4 triangular-wing models with the wing plan forms modified to form trapezoidal wings of-aspect ratio 2 and taper ratios ,of 0.2Q and 0.33, respectively. <br>Tests were made to ascertain the effectiveness of a high-lift device, two types of lateral controls, and a directional control, using .. control-surface deflections typical of those used in landing. The - horizontal tail was tested in three vertical locations in order to determine the. effect of horizontal-tail vertical location on the longitudinal stability. The wings of both models had slotted, trailing-edge flaps which-were tested both as high lift devices and lateral controls. An all-movable horizontal tail was tested as a longitudinal control on both models, and as-a lateral control on one of the models. A rudder of constant chord was tested as a direct Loan 1 control on one model. The data are presented-without analysis to expedite publication.