In the early 16th century, Leonardo da Vinci dedicated particular attention to the study of flight and to the design of a flying machine. Being able to realize the enterprise of human flight represented his most ambitious challenge, in fact he decided to write a treatise on the subject, divided into 4 chapters. The replication of the code gives detailed descriptions of details in which Leonardo indicates the materials to be used in construction, the position of the pilot, the location of the center of gravity, the latter factor essential for the construction of any flying object. On sheet 3r Leonardo notes: “Divide the treaty of birds into four books, of which one is to fly by flying; the 2nd of the flight without wing blows, the for wind favor. the 3rd of flying in common, like birds, bats, fish, animals, insects; the last of the instrumental motion “.
