WIND-TUNNEL INVESTIGATION OF CONTROL-SURFACE CHARACTERISTICS XX - PLAIN AND BALANCED FLAPS ON AN NACA 0009 RECTANGULAR SEMISPAN TAIL SURFACE

摘要

Force-test measurements have been made in the Langley 4-by 6-foot vertical tunnel to determine the aerodynamic characteristics of an NACA 0009 semispan tail surface of rectangular plan form equipped with flaps of various nose shapes and overhangs. The flap chord was 30 percent of the airfoil chord. A few tests were made to determine the effectiveness of a balancing tab on various flap arrangements.