RE: Sr. Falcon
Outstanding airplane! Got one I've been flying since 1974 and I've had few, if any, problems with her. Having been in the air all this time, she shows her age a bit (lost the side sheeting for the engine more than 25 years ago) but she's absolutely never let me down.
Using a OS-.45LA and 11x6 prop she won't go vertical and hang on her prop, but when she had the old Fox-.45 she did. I've got a older (now) computer radio on her that I've interhooked the ailerons & rudder together (aileron control also works the rudder) and I occasionally use the flap function which turns them into flaperons - mostly for things like horizontal "8"s right in front of me (she'll do a 15' circle with flaps & elevator working together).
Anyway, The biggest modification I made when I built her was to give her a flat wing - almost no dihedral at all, and it's always worked for me. Loops, outside loops, rolls, point-rolls, knife-edge, spins - no problems at all.
Pics below show her in the original red/white/blue scheme from 1974 using a Enya .35 which wasn't quite enough power to make her perform decently, but she DID fly with it. Other pics are my baby as she is today with the side-mounted OS45LA & Pitts-style muffler, covered in transparent green & white.