On folio 9v of Manuscript B Leonardo drew a warship equipped with a giant scythe. He cited the source of this invention in his description by explaining that it was used to cut the rigging and masts of enemy ships. He also observed that once the rigging was cut, the sails would fall on the enemies, thus preventing them from effectively defending themselves. A large scythe is placed on a warship with several oars to make it fast and maneuverable. The scythe can be placed vertically or horizontally and the large weight on one end allows it to rotate if vertical or act as a counterbalance if horizontal. The scythe is activated by releasing a rope.
Manuscript B, folio 9v