The determination of the angles of attack of zero lift and of zero moment, based on Munk's integrals
This is a 1923 NASA technical report on aerofoil theory, issued by the NASA Technical Reports Server and aimed at aeronautical engineers and researchers calculating zero-lift and zero-moment angles of attack from Munk's integrals. Its pictures are plain line diagrams of wing cross-sections, with the mean camber curve, chord line, x-axis, and percentage-chord markers labelled. A designer could take from them a clean technical vocabulary of thin dashed-curve profiles and dimensioned annotations.
