Travel back in time by constructing a model recreation of a classic 15th century design with this pathfinders da vinci aerial screw helicopter model kit one of da vincis most iconic designs the aerial screw displays the ingenuity of da vinci fully and reflects his obsession with flying while this idea may never have got off the ground so to speak the design gives an insight into da vincis approach to the the challenge of human powered flying and defines him as an inventor well ahead of