Hi RCKen
A knife edge loop is a great target to aim for. I'm trying to think which plane I will try it with. A few years ago I tried it with my SPAD Canard and it was a disaster. I had been moving the CG back so that it could comfortably do a knife edge. I had the CG so far back that I noticed that it could go vertical in Knive edge. I usually would stop the knife edge after it passed the vertical by about 45 degrees. One day I decided to go for a full loop. I started very high, about 4 mistakes high. The darn thing went into an inverted flat spin and nothing I could do could stop it. Scared the heck out of me. After reading the fun you are having I will try it with one of my conventional configurations. My SPAD Biplane.