This project comes from the ancient Roman battlefield in the age of cold weapons. The soldiers made a gun rack with bamboo and rope that could shoot stones. Therefore, he won the battle again and again. In this project, students are divided into two opposing camps, distributing bamboo and rope respectively, making them into gun racks, and then using balls filled with water as simulated stones, and the two sides attack each other. This project fully embodies the preparation, planning, command and division of labor.

On the battlefield of ancient Rome, there was no gunpowder. When the ancient Romans faced the high city in the war, they used some simple materials to build a siege weapon of the trebuchet, which was called the Roman gun rack. The strength and effect at that time were very considerable.

Principle: lever principle

Production method:

Materials: chopsticks, rubber bands, spoons. As for shells, plastic balls can be used.

First, tie two tripods with chopsticks, and then use a chopstick as a shoulder. Then two chopsticks are tied together to make a launching rod, which is connected with a magazine spoon, which is the main part of launching weapons.

Pay attention to another connection at the bottom of the tripod to avoid unstable support, lengthen the distance between the key point and the fulcrum, shorten the distance between the stressed point and the fulcrum, and increase the strength. The gun shaft must be stable enough to avoid breaking the gun shaft due to excessive force during launching. There are also some objects that have to fly in parabola to have the longest range.

Extended data:

In China, this project is often used to exercise team cooperation and team spirit, define operational objectives, formulate and modify operational plans, enhance leadership and strengthen execution.

Divide the big team into several small teams in the fixed battlefield and use resources to form the Roman gun rack. All players must enter the designated activity area and use the tied Roman gun rack to send water bombs to attack the opposing team members. Note: The production principle is based on the "lever principle".

Props:

9 wooden poles or bamboo poles (3m long, 6-8cm in diameter), 8 ropes with binding points (8 ropes with length of 1 .5m/root), 1 plastic water scoop,1plastic bucket, 50 balloons, a roll of balloon-tied string (wool), etc.

Baidu encyclopedia-Roman gun rack