The object of this study was to discover to what extent the rudder can be balanced without causing pilots to complain of an overbalanced condition. The dimensions of the various rudders in use on military airplanes were collected and an expression was developed to show the relative extent to which these rudders are balanced. Pilots observations on the actions of these rudders were also obtained and are given under the heading "Remarks" in the table. This study shows no definite relation between the balanced coefficients and the pilots remarks. It may, therefore, be that rudders which are reported as overbalanced are not really overbalanced, and that other yaw characteristics of the airplane have resulted in producing that impression on the pilot.