61009 - CATAPULT MECHANICAL LEONARDO DA VINCI MODEL KITSLeonardo da Vinci improved upon the alreadyestablished catapult design when he introduced his own vision of the ageold military launching device. This design uses a double leaf spring to produce a great deal of energy in order to propel stone projectiles or flammable materials over large distances. A hand crank on the side of the catapult was used to load the spring. The scientific genius of Leonardo da Vinci is brought to life through this