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http://news.yahoo.com/blogs/sideshow/ufos-over-denver-maybe-175541305.html

kinda crazy, but i've seen guys build some stange stuff that flies.

Hah, they say it happens several times during the week, right around lunch time.

Duh, it's a guy with a foamie airplane on his lunch break.

thats what i thought, but they keep saying it moves very fast.

but if it's tiny it only needs be be sort of fast to not been seen easily.

i know of a flying pizza that will make you think twice, but this one's a bit odd.

plus if it's small, even if it's metal it won't show up on radar.

yeah rc for sure, the rc club next door to our oval has guys flying all sorts of crap out there on weekends.

probably a quadcopter or foamie



maybe its the new traxxas helicopter

http://www.bigsquidrc.com/traxxas-qr-1-high-performance-quad-rotor-helicopter/

Could be a popwing or something like that... they're incredibly fast with the right setup.
The video reminded me of this: http://www.youtube.com/watch?feature=player_embedded&v=M28KLI5DMvQ
And here's another: http://www.youtube.com/watch?v=rKC2zE-HgcE