The Effect of Surface Irregularities on Wing Drag. II - Lap Joints. 2; Lap Joints
This is a 1938 NASA technical report, published by the National Advisory Committee for Aeronautics as part of its series on how surface irregularities affect wing drag, written for aeronautical engineers and wind-tunnel researchers. Its pictures are plain engineering line charts of drag percentage increase against position, plus schematic side views of lap joint types such as plain, faired and joggled laps, drawn in fine black ink on squared grey paper, useful to a designer for sketching simple seam and panel-edge profiles.
