Maybe it is a prototype issue, but it does seem to be very noisy for a surveillance device.
In those confined spaces it makes quite a bit of noise, but probably wouldn’t be that noticeable out in the open or in a city where there is already so much noise.
It appears, if my memory is still intact, that `Popular Electronics` came out with plans for this design 40(?) years ago, but not remote control.
A different video
World’s first controllable MAV monocopter, Robotic Samara (maple seed)
http://www.youtube.com/watch?v=u23Hqq8QbeE&feature=player_embedded#at=26
That thing is too noisy and unstable compared to common battery powered remote control helicopters available at many hobby stores.
http://www.alibaba.com/showroom/rc-helicopter-hobby-battery.html
http://www.lancealbertson.com/2011/01/diving-into-a-new-hobby-with-rc-helicopters/
Of course that gets them the other bazillion bucks to develop a super spin stabilized boomerang camera.
I agree that my RC copter is a better choice. It can fly through doorways,land in a circle AND carry an of the shelf
wireless video camera.
Samn, that thing makes a lot of noise.