Hey dude, looks like you did a great job on that yak. We've been fighting the weather here in Loisiana, but I finally put the maiden flight on mine today. I've got an old YS 1.20 4 stroke on mine. After a couple of trim passes, I turned it knife edge at half throttle. I rolled it and by instinct fed in about half of the rudder to catch it. Before I could react, it yawed until the nose was straight up and started to hover. Woooooh! It doesn't take much rudder to hold knife edge. I haven't tried it yet, but I'm sure it will do multiple knife edge loops. Had to leave the field early, but I can't wait to get some stick time on this thing. It's so cool to have a profile without the tank and wires hanging out. Good luck with yours.