Thanks Autorotate
Appreciate that you see my point.
The issue of the tar if you care to read the post which you are in possession of, mean't that what you post here may not stick to you but it does reflect on ALL pilots.
As for the fact that the D model was in front of a crowd at an airshow hardly qualifies it as legal or condoned just because nobody did anything. I suppose you asked Kieth - or doesn't he have any rights if you took the photo.
Aesir - read the section, normally 4 in any flight manual - Limitations. Obviously it is not going to say "none". FAA Part 27 and 29 refer to Normal category not Aerobatic.