The invention relates to an unmanned helicopter comprising an internal combustion engine and an associated fuel tank. The unit (1) formed by the internal combustion engine and the gearbox is arranged essentially in a self-supporting housing (2) which is at least partially closed all the way round, and preferably consists of carbon fiber-reinforced plastic (CFK), a nose body (3) being connected to the front of said housing. In this way, a compact structure can be achieved.