Ok, I did some research, and Jim, your are correct in that the catalog referee to a non droop Hoerner wing tip... however, Dr. Hoerner designed several wingtips to deal with the effect of vortices. And, the Model 3 "droop" is a Hoerner tip by design, although not as listed in the catalog, and was used on Piper Pawnees and other aircraft, not all as exaggerated and the Model 3 was.
Ralph