The Characteristics of the N.A.C.A 97, Clark Y, and N.A.C.A. M6 Airfoils with Particular Reference to the Angle of Attack
This is a 1927 aeronautical technical note from the National Advisory Committee for Aeronautics, issued as NACA Technical Note No. 270 by NASA's Technical Reports Server and aimed at aircraft engineers. The four pictures are engineering charts plotting lift and drag coefficients against angle of attack for the N.A.C.A. 97, Clark Y and N.A.C.A. M6 airfoil sections, drawn as thin black curves on gridded paper with handwritten labels. A designer could take from them a sparse, diagrammatic graph style with labelled curve families and dense annotation that suits technical infographics.
