Effects of streamline curvature on lift of biplanes
A 1927 technical report from the NASA Technical Reports Server, a scientific paper on aerodynamics, written for aeronautical engineers and researchers studying how curved airflow affects biplane lift. Its pictures are plain line diagrams with labelled points A, B, S and a central axis, showing geometric construction of a curved arc and a deflected chord line, which a designer might borrow as a clean schematic motif for technical drawings.
