It was long ago in 1977 when I got checked out in an S2A. The pilot instructing me was a highly respected competition and airshow pilot in the Phoenix area. His name was Walt Tubb. I only flew with him 3 times to prep for flying my newly acquired S1S home from Florida to AZ. Since almost everything you wanted to know is on-line now, I thought I check to see if anything was out there on Walt. There is and here is the article I found.