As for the "big boom", you're simply not going to get that legally. It's not just the AMA that doesn't want you carrying aloft things that go BOOM. Since 9/11, I'm fairly certain that the Fed has put some laws on the books that very specifically target people who try to make anything that could make a loud boom. And their laws don't cut "toy BOOMS" any slack. And I think they've not only put blanket law on the books covering bomb making that'd cover darn near anything you think would be safe, but I think they've also specifically included detail about "remotely piloted" craft carrying almost anything and everything.