Making the frame and arm for a Trebuchet (Partial project)

Picture of Making the frame and arm for a Trebuchet (Partial project)
Me and my friend wanted to make a trebuchet, so here's what we got.

(For some reason or the other i stopped taking pictures half way through, but I'll try and explain what else I did.)
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Step 1: Planning

Picture of planning
We looked around on the internet and found some pretty heavy math involved in the building of a trebuchet (more than we liked to get into at least) and we found some plans for "desktop trebuchets" but we wanted something a bit bigger. We didnt do much planning except looking at other models and different peoples takes on how to build one, so this isn't perfect by any means, but it worked for us. Hopefully we could get some new ideas and maybe help other people get a basic idea on how to build there own trebuchet.

Step 2: What you're gona need

Picture of What you're gona need
We planned on wingin' our materials just like we did our plans, but we eventually decided that a trip to the hardware store would be necessary. We took a guess at how much of everything we would need, and this is what we got...

We purchased:

8- 2x4's,
1- 1 foot, 1/2 inch diameter bolt with two washers and a nut
1- 1/2 foot 5/16 inch diameter bolt with two washers and a nut

We also used a bunch of junk that I had lying around in my basement. You might need to purchase these items if you dont have them...

2- 2x2's
2- 25 lb. weights (from a benchpress)
Cloth for the sling pouch
Rope or chord of some type
Staple Gun
Wood Screws
A big washer
A finishing nail


A saw (a chop saw works best)
A drill/screwdriver
Drill bits

Like I said, we were wingin' this entire project so you might need to improvise here and there.
kumarrockon5 years ago
Love it!
I want to scale it down for a school project,
any suggestions?
I hope you realize the frame isn't near wide enough for a bucket of weights. however you could use barbell weight disks
BigCoCo (author)  corey_caffeine6 years ago
I never really intended to use "a bucket of weights" for this project. as you can see from my materials list and the picture in step 2, I used 2- 25 pound weights from a bench press. im not sure if thats what you meant by barbell weight disks, but they fit very well in the narrow gap provided by the frame.