The 6A-series of cambered airfoils were described and reported in NACA Rep. 903. They use a special form of the 6-series camber line. This special form is designated as the "A = 0.8 modified mean line." The modification consists of holding the slope of the mean line constant from the 85-percent chord station to the trailing edge. This mean line is always used with 6A-series airfoils.
The equation for the 6A-series camber line is rather complicated and there is little value in displaying it here. It may be found