T28D:
At the speed you would be inverted in a loop or barrel roll the ability to get an overstress through "G" is impossible.
Maybe a bit of real aerobatics instruction would be a good idea.
1. Don't EVER challenge the Sunfish ability to do something impossibly stupid and break an aircraft.
2, I don't need more encouragement to do aerobatic instruction. I love it. Its addicitive. I just need more time and opportunity to finish the endorsement/rating.
Merry Christmas to all.