What could possibly be smaller than the Micro Air Vehicle? This little drone, a Nano Air Vehicle (NAV), is an extremely small, ultra lightweight flying machine that can be used for both indoor and outdoor military missions. The Defense Advanced Research Projects Agency is exploring flapping wing and other configurations that are maneuverable, but surreptitious. Design features include high lift-to-drag airfoils and efficient propulsion and power systems.
Image credit: DARPA