The Samarai Monocopter, developed by Lockheed Martin, is only ten inches long. But the designers don't plan to scale it up, but down. Their goal is to make one the size of a fingernail with a camera attached. Soldiers would be able to use such a device to scout nearby areas without exposing themselves to hostile fire.
At the link, you can watch a video of the Monocopter in flight. Link -via Geekosystem | Photo: Lockheed Martin