Rixin Catapult ver. 2 This is made for Science/Physical education. Students will learn the mechanics from this strcture . This version can adjust the throwing angle, and you can adjust the launch of rubber band strength. You can get the assembly information of the catapult from the following website :

--> https://sites.google.com/a/mail.zhps.tp.edu.tw/qqmanwu/zui-xin-xiao-xi/rixinerdaitoushichezuzhuangjiaoxue

Hope you like this work.

Shu Chen Wu / 20171214