Barrel loop
1. I have seen quite some years ago a 206 do it, so yes, it is possible. But NO you should not do this (I'll try to find out if the pilot is old and bold....)
2. Same old story as before about my R44 simulator : it really starts working well, but it takes quite some time to learn to fly with it . This looks more difficult than the real thing, you only have visual clues. I also approach it off-line, that is create sec by sec control sequences that I playback, but that takes time...
Up to now I stick with hover, landing, take-off, autorots etc and validiate standard enveloppes. Of course loops etc are tempting, and this is btw of course the first things my kids want to do with it, but so far margins seem incredibly thin and they seem to crash...
Computer used : standard (uptodate) PC.
Delta3