One of Leonardo’s most iconic images, the Aerial Screw (also known as the Helicopter) illustrates the ingenuity of da Vinci, and indicates (along with many other drawings!) his obsession with flying. A great kit for beginner to advanced model makers, this is a great way to learn about gears, flight and brings Leonardo’s iconic drawing to life. Takes between 1 and 3 hours to make. (Glue has to dry!) This is a great project that works well and looks really cool on the shelf!