I've been working on this weissinger's method for finding symmetric span loading for sometime but I'm not able to get the results properly. I'm following the NACA report No. 921 by John DeYoung et al. The problem I face is with the L function given in the report. In all the places where v equals mu, the function goes to infinity causing the lift too to become infinite. I cant figure out what to do at these spanwise locations. Pls help me out if anyone knows.