They already have this, it's called AMA, and I'm a member: http://www.modelaircraft.org/membership/membership/overview.aspx http://www.modelaircraft.org/member

They already have this, it's called AMA, and I'm a member: http://www.modelaircraft.org/membership/membership/overview.aspx http://www.modelaircraft.org/membership/membership/overview.... Pretty sure it only covers you at AMA-designated sites, though, so might not help much for this use-case. That said, I'd never think to fly my relatively-small 450-class electric heli over a crowd. Then again, people would likely run screaming if I did, since they're much less tame/stable than quads, and pulling lots of pitch definitely creates the "blade thump" which you can feel in your chest even at this size (325mm blades, so ~30" blade disc).