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Hi Bruno,
In the US the builder is responsible for stating the operating limitations 
for the aircraft.  Based on Andy Draper's advice I made my operating 
limitation to be a MAW that would ensure that the aircraft could only 
perform aerobatics solo, and I added a tighter tolerance for the forward and 
aft C o G's.  I excluded maneuvers that had a negative G component, along 
with anything that had a tail slide.
Now with all that said, the limitations I added weren't based off any 
structural calculations, it was from my informal discussions with Andy.
Since I have flying all I ever do is rolls, loops and the occasional spin. 
I'd like to do more but I need to find an instructor to teach me.
Paul 
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