AN EXPERIMENTAL STUDY OF THEnZERO-ANGLE-OF-ATTACK TRANSONIC DRAG ASSOCIATED WITH THE VERTICAL POSITION OF A HORIZONTAL TAIL AT ZERO INCIDENCE

摘要

An experimental study has been made of the transonic drag associated with varying the vertical location of the horizontal tail of a repre¬sentative tail-body combination. The tail had zero incidence. Factors which significantly influenced the results were flow separation in the horizontal tail-body juncture, afterbody-tail-interference pressure drag, and a downwash over the horizontal tail which resulted from the boundary conditions of the converging afterbody. Inasmuch as these factors are present, the calculation of the empennage drag by use of area-development methods may possibly be subject to large errors in cases where the hori¬zontal and vertical tails are located near but not in the planes of symmetry.