Mass distribution and performance of free flight models
This NASA technical report from 1927 is a government aeronautics study of how weight is distributed in free flight model aircraft and how that affects their flight performance, produced for aeronautical engineers and researchers. The one picture is a line drawing of a small monoplane in side view labelled Fig. 3, above a labelled isometric diagram of two rectangular blocks labelled Fig. 4 with dimensions a, b, c and d. A designer might take from it the clean technical line style and the simple labelled block-and-dimension diagram layout.
