Eleventh Rhon soaring-flight contest, 1930
This is a 1931 NACA Technical Memorandum from the NASA Technical Reports Server, recording the eleventh Rhön soaring-flight contest of 1930 for aeronautical engineers and glider researchers. Its pictures are plain black-and-white flight-path plans, topographic contour maps with dashed routes, and a vertical-speed graph of a glider's climb, showing how flights were traced over ground. A designer might take the clean technical linework and contour-map layouts as reference for route diagrams or data-visualisation styling.
