I loved this rocket as a kid and was lucky enough to have huge open fields to fly them in and did not lose this rocket the 1st time I flew it. I had started getting parts together to do a fiberglass min dia rocket and I am thinking of going with the classic Estes Astron Sprint. But I am pretty uneasy with the fin length and RocSim shows it stable but will over Mach. Those fins are really long and flutter is a big concern. So tossing this out there for thoughts. What say you?