REFERENCE Methods
The measured edge radius is defined by fitting a circle to all measured points that fall in a 180 degree wedge that starts at the termination point of the measured mean camber line. The center vector of the wedge is the termination vector of the nominal mean camber line.
The nominal edge radius is defined by fitting a circle to the 3 points on the nominal edge. One point is the intersection of the termination of the mean camber line. The other two are the intersection points of the edges of the wedge described above.
120 and 90 are the same as 180, except that the wedge sweeps through less angle.
These methods are available for the following calculations:
LERAD
TERAD