Aerodynamic characteristics of circular-arc airfoils at high speeds
A 1932 NASA technical report on aerodynamic characteristics of circular-arc airfoils at high speeds, presented as a series of polar diagrams plotting lift coefficient against drag coefficient for several airfoil sections. The plots compare R.A.F., Clark Y and circular-arc profiles with labelled angle-of-attack markers, giving a designer a sense of the technical line-graph style of engineering documentation of the period.
