Around 1500, Leonardo returned to the old passion dell'ingegnere military and its interests affissano on new conceptions of fortified architecture and also on ballistic studies, revealing the evolution of his research on the instruments of war and all that attenesse all ' art of war. Of great importance to the accuracy of the shot are the ballistic studies addressing such as Leonardo realized with the help of jets of water, the influence on the trajectory of cannon balls. It solves the problem of designing projectiles ogival incredible modernity that exploit the aerodynamic shape and directional wings of which are accompanied.
E. 1508. Code Arundel