The chart accompanying this note refers to symmetrical aerofoils of the N.A.C.A. family, but the ordinary magnitude of the mean camber will have no practical influence on the results if it is also used for non‐symmetrical aerofoils.
David, F. (1940), "Aerofoil Sections and Torsion: Geometrical Properties of Symmetrical N.A.C.A. Aerofoils for use in Torsional Calculations", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 2, pp. 44-44. https://doi.org/10.1108/eb030608
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