Giant Crossbow Leonardos giant crossbow was a veritable "technological dream". It was intended for creating panic and fright among the enemies just by its wingspan of 24 meters and a length of 23 meters. Even tough as a model kit the crossbow is a little smaller and actually it can't shoot for security reasons, all its parts are movable. It was designed by the original drawing and the historic model of the Museo Nazionale della Scienza e della Tecnologia Leonardo da Vinci Milano.