Stingray Glider Initial Trials (Approximately failed test flight #50/70)

This was a typical, self-destructive flight of my "Staples Stingray" glider until I was fiiiiinally able to get it to work well, after many modifications to change the airplane's dynamic stability. I spent well over 12 hrs. doing flight testing, attempting to get it to work. This was something like the 7th hour. For a later series of SUCCESSFUL FLIGHTS, see my post on the airplane here: electricrcaircr...
...and see the following videos:
1) • "Staples Stingray" Fre...
2) • Stingray Free-flight g...
3) • "Staples Stingray" Bun...