An absurdly small tri-copter
The team behind the Femtoduino - an extraordinarily small repackaging of the Arduino - sent in a few videos from YouTuber , a.k.a. that shows one of the smallest multicopters we've ever seen.
Because this isn't a traditional quad or hexcopter, the control system is a little weird. Two of the motors and props are fixed along the vertical axis, while the rear prop is connected to a small servo to rotate from side to side.