you HAVE to respect the BO-105:
i admit it sounds like a bad porno but i love this video!
it is mathematically impossible for either hummingbirds, or helicopters to fly. fortunately, neither are aware of this.
I got to see that guy do the Red Bull demo for RBAR in NYC and I was floored, but that video is just insane!!!! I also remember seeing a video (of a different type) of some circus performer who did a demo with some guy on the ground...interesting stuff and absolutely incredible what they do/can do with a sling wing.
I spy something blue.