Well I guess bob Hoover was also a moron. He looped amd rolled everything he flew and also said any airplane could be rolled or looped as long as the g limits of the plane wasn't exlxceeded. And the positive g for the 150/152 is 4 g's im sure he didn't exceeded them. I have a 150h and I haven't looped or rolled it but I have done rolls,loops, and hammer heads in an RV6 and entered the loop at around 200 and pulled pretty hard going into the loop and never even hit the 2g mark and on rolling the rv never got above 1.5 g's and the most of that was pulled coming out of the roll. It isn't legal to roll a 150 or 152 that isn't an aero bat but it's perfectly safe as long as you don't mess up. If you do then your in trouble because you don't have that 2g cushion that an aerobat has and yes you will probably die