Step 5War!
1. Prior preparation - make up as many sets of parts for catapults as you need. It will be at least one for each team, and I suggest you have a minimum of one catapult per three players. You can also print out a diagram of the finished catapult for each team to check. Obtain a quantity of suitable ammunition - say, a bowl of ping-pong balls.
2. Show your players how to make and fire the catapult, then split them into two or more teams.
3. Give each team their catapult components, place the bowl of ammunition between them and shout "go!"
4. The teams must then build their catapults as quickly as possible, then send members into the middle of the playing area to collect ammunition and start firing at the other team.
You may wish to rule that they can only pick one ping pong ball at a time from the bowl, but pick up as many loose balls at a time as they wish.
5. The object of the game is to knock out the opposing team by hitting players with ping pong balls. Any player hit by a ball is out, and the battle must be continued by the remaining members.
Winning can be decided either by "last man standing", or the team with the most members left after a set time.
Who needs airsoft? This is war
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and all those stuff?
The structure is under compression, but that translates into shear at the joints, because the two longer poles that the catapult elastic is fastened to try and force the side joints to slide down the side supports.