Flight-test data on the static fore-and-aft stability of various German airplanes
This is a 1933 NASA technical report of flight-test measurements on the static fore-and-aft stability of German aircraft, compiled from test records for aeronautical engineers. The one picture is a line graph plotting the stability derivative dcm/dca against percent t, with three dashed lines labelled a, b and c marking separate test series. For a designer it offers a sparse, clean technical chart style with labelled dashed trend lines on a fine grid.
