Tests of N.A.C.A. airfoils in the variable-density wind tunnel Series 230.
A 1936 NASA technical report of wind tunnel test results for N.A.C.A. airfoils in the Series 230 family, issued by the National Advisory Committee for Aeronautics for aeronautical engineers. Its pictures are dense engineering graphs of lift, drag, and pressure-centre curves plotted against chord position, with tabulated coordinates and airfoil section data, offering a designer little beyond the stark plotted-line vocabulary of mid-century technical drawing.
