To say that I had done such things, could incite someone else, which I should not do. To say I had not, would be untruthful. I have extensive experience flying Tomahawks and quite like them.
I have never done aerobatics in an aircraft, which the owner had not approved of in advance. I received many hours of competent training in aerobatics in an Aerobat 150, from it's owner. He also demonstrated two very fine rolls to me, while I was a passenger in his C 185 amphibian.
I can say that I do occasionally loop and roll a standard C 150M, which I own, and is equipped with a G meter. I do this to maintain my proficiancy in handling unusual attitudes (necessary skill in my work). I have only once come close to exceeding a limitation (speed) while flying my 150, and I learned from it, and will never again.
During certification flight testing, and in accordance with the flight test plan, I spun a Lake Amphibian, with power. This, done to the right, results in more of a roll, than a spin. Though it worked fine, I consider this to not have an adequate margin of safety, and am unlikely to repeat it.
Competent aerobatic instruction is very worthwhile, and in appropriate aircraft, should be sought out by pilots. Casual/experimental aerobatics, particularly in aircraft for which such maneuvers are prohibited, are very high risk, and very unwise. Attempting to teach one's self aerobatics is very unwise.
With great care, and in accordance with an approved flight test plan, limitations are exceeded during testing, to assure margins of safety for careless pilots:
