Medieval Trebuchet

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Project by JeffL115 posted 10-29-2012 02:59 PM 2216 views 3 times favorited 15 comments Add to Favorites Watch

This was my very first wood project and led me into the world of fine woodworking! I had to make a catapult for a HS science class, and my friends and I decided to make a much larger version for fun.

The Trebuchet is constructed of mostly scrap pine except for the two large main boards that are perpendicular to the base which are oak. It is attached together mostly with large screws. The siege weapon stands about 20 feet tall when the arm is at rest. The main axle is an Olympic barbel and is quite heavy. The counterweight was filled with cinder blocks and solid steel plates, totaling over 300 lbs. The sling was constructed of twine and the sling pouch was made out of cow leather. I installed a winch system that would lower the arm and slide along a steel wire for added leverage as the arm was brought down. The machine is a bit dangerous as I never could figure out a good release system. To fire you have to hold the arm down by hand then jump out of the way to release & fire the siege weapon.

This project was a lot of fun. It can fire bricks and bocce balls over 150 yards and pretty much anything else that will fit into the sling about 100 yards. However, it is not accurate at all and the projectile can land anywhere within a huge radius of the target. I think this is a rather unique project and thought that I would share it with you all. Enjoy!

15 comments so far

View ratchet's profile


1376 posts in 3055 days

#1 posted 10-29-2012 03:13 PM

Dude….you must be fun at parties. Excellent build!!!

View a1Jim's profile


114790 posts in 2845 days

#2 posted 10-29-2012 03:39 PM

Looks like fun. I saw one on TV they were throwing pianos and small cars with, what a kick.

-- Custom furniture

View Dale 's profile


412 posts in 2448 days

#3 posted 10-29-2012 03:55 PM

That is way to cool.

-- Dale West Central Pa. Do it all, before last call.

View HalDougherty's profile


1820 posts in 2505 days

#4 posted 10-29-2012 07:06 PM

Last night the Discovery channel had a special about the “Punkin Chunkin” contest… Your machine would fit right in. The projectile is an 8lb pumpkin. I bet a quick google search would turn up photos and even diagrams showing release systems. Good luck with your machine and be careful! A brick thrown 150 yards hits like a brick shot out of a trebuchet!

-- Hal, Tennessee

View Ben's profile


273 posts in 2981 days

#5 posted 10-29-2012 08:26 PM

Its always nice to build something which has no purpose other than fun.

-- Do something nice for somebody

View Fishinbo's profile


11362 posts in 1443 days

#6 posted 10-29-2012 09:34 PM

This is really fun to look at! We made a catapult fo r a high school project, too. But we never made it this far! Great work!

View whitewulf's profile


450 posts in 2205 days

#7 posted 10-29-2012 11:03 PM

Fun project, is the rope around the pivot under tension, or jus for looks?

-- "ButI'mMuchBetterNow"

View NormG's profile


5248 posts in 2272 days

#8 posted 10-29-2012 11:56 PM

What a fun project. I have seen the shows on TV as A1Jim has. I have the plans for a smaller version to build with my kids

-- Norman

View rance's profile


4217 posts in 2428 days

#9 posted 10-30-2012 12:47 AM


And welcome to LumberJocks.

-- Backer boards, stop blocks, build oversized, and never buy a hand plane--

View Monte Pittman's profile

Monte Pittman

20094 posts in 1606 days

#10 posted 10-30-2012 01:03 AM

I assume you’re taking this to college. It’s just meant to be at a frat house somewhere.

Good job

-- Mother Nature created it, I just assemble it.

View plantek's profile


312 posts in 2067 days

#11 posted 10-30-2012 11:50 AM

Very cool!

-- If you want it and it's within reason... It's on it's way!

View solardave's profile


71 posts in 1312 days

#12 posted 10-30-2012 12:36 PM

Awesome. Time to collect some old bowling balls…

View JeffL115's profile


10 posts in 1306 days

#13 posted 10-30-2012 04:13 PM

The rope around the pivot point is just for looks.

View HorizontalMike's profile


6996 posts in 2182 days

#14 posted 10-31-2012 01:31 AM

Now THAT would be fun! Very cool!

-- HorizontalMike -- "Woodpeckers understand..."

View ajosephg's profile


1877 posts in 2829 days

#15 posted 10-31-2012 09:31 AM

Regarding accuracy: I built a desk top trebuchet and found that accuracy is proportional to uniform projectile weight. Shape is also important due to aerodynamics. It’s been a long time, but I think the math shows that the maximum range is achieved with a projectile weight that is 1/100 of the counterweight.

-- Joe

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