I used to think that the 11" blade being spun by a O.S. .46AX on my plane was dangerous and it is; however after watching some video of some of the higher performance T-Rex helis out there I am beginning to think that they could hurt someone pretty good as well. I have my first heli on order and its pretty clear that these are not toys and should be operated nowhere near people at least untill i get proficient at flying it. Just looking at pictures you would never suspect how much power and energy those little brushless motors have. just an observation...