The most complete catapult in history - 114 catapults, began to be popular in the 1970s and 1980s. A catapult is a cold weapon or a game tool. The slingshot is generally composed of bow frame, leather bar and leather pocket. It is usually made of branches of trees, which is in the form of Ya. The upper two ends are tied with leather ribs, and the middle part of the leather bar is tied with a piece of skin wrapped with bullet. The strength of the slingshot depends on the tension of the leather bar and the rebound speed of the leather bar. The larger the tension of the leather bar can match the heavier projectile, the faster the rebound speed of the elastic bar can provide a larger initial speed to the projectile, the heavier the projectile, the higher the initial speed, the greater the power.