Bizarre RC Helicopter footage

Followed a link from boingboing to a site with aircraft crash footage on it.  There's some very scary footage there.  But there's also an amazing demonstration involving an RC helicopter.  Uh, yeah, I don't understand why this (admittedly very long -- 14.7 MB) movie is hosted on what looks to me like a porn site, but there it is.  The guy does things there that I thought were aerodynamically impossible without ever crashing the helicopter.