= = = = = — speed of sound, in units of limiting velocity pressure coefficient airfoil profile undisturbed-flow Mach number pressure gas constant entropy temperature Cartesian coordinates velocity components in x and y directions, in units of limiting velocity velocity, in units of limiting velocity ratio of specific heats flow inclination to undisturbed stream Mach angle behind shock wave at airfoil leading edge shock wave inclination to undisturbed stream coordinate system defined by Eqs. (3) shock-wave profile in (£, rj) plane slope of shock wave in (x, y) plane values of v and 5 at the leading edge ratio of shock-wave curvature to airfoil curvature at leading edge