The second digit determines the location of maximum thickness in tenths of chord. Increasing this value specifies an increasingly more rounded nose. A value of 6 indicates that the nose radius is the same as the original airfoil while a value of 0 indicates a sharp leading edge. The first digit following the dash refers to the roundedness of the nose. The first modification we will consider is the 0003-64. This shape is a symmetrical airfoil that is identical above and below the mean camber line. The basic shape is the 0003, a 3% thick airfoil with 0% camber. Let us consider the root section, the NACA 0003.46-64.069, as an example. The airfoil sections you mention for the B-58 bomber are members of the Four-Digit Series, but the names are slightly different as these shapes have been modified.
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