There was a Berkley Guardian Stunter. As I remember it had short moments, a thin symetrical airfoil, and wing span about 50" (I think). Probably not the best, but I have never seen one fly.
About 20 years ago. many of the Garden State Circle Burners, made profile versions of the airplane and used throttles. They flew formation flights for both fun and demonstrations. The airplanes were painted in navy colors, and not all the very dark Corsair blue.
They had a ball with these airplanes. The late Augie Buffalano of the GSCB, gave me some cut up rough drawings of the modified airplane.
Unfortunately, I don't have any pictures.
Bill Werwage also designed a full stunter to look like the Guardian, but I don't think he ever competed with the airplane.