Investigation of Horn Balances on a 45 Degree Sweptback Horizontal Tail Surface at High Subsonic Speeds
This is a 1948 NACA technical report from the NASA Technical Reports Server, a restricted wind-tunnel study of horn balances on a 45-degree swept-back horizontal tail at high subsonic speeds, written for aeronautical engineers. Its pictures are plain black-and-white line graphs on gridded paper, with multiple labelled curves of hinge-moment, drag and lift coefficients plotted against angle of attack and Mach number. A designer could take from them only the visual grammar of technical charts: dense overlapping data lines, stacked axis labels, legend boxes of open symbols, and a faint 'CONFIDENTIAL' header.
