This project was built and designed by Drew Fisher from Fisher’s Shop. It’s a hands-on, family-friendly build that brings medieval mechanics to life in your backyard.
A trebuchet is a type of catapult that uses a counterweight to launch a projectile. Drew’s version combines traditional woodworking with clever problem-solving for a project that’s equal parts fun and educational.
Watch the full video and subscribe to Drew’s channel:
Getting Started with the Design
The process begins with sketching out the design in Fusion 360. This step helps ensure all components fit together properly and move the way they’re supposed to.
Using design software also allows Drew to simulate the tool paths. This makes it easier to prepare each part for cutting, whether using a CNC machine or traditional tools.
Cutting the Parts
Once the design is ready, the next step is cutting the plywood pieces. Drew uses scrap material from earlier projects, showing how leftover wood can be repurposed into something exciting.
He cuts the main pieces on a CNC machine, but the project can also be done with a jigsaw and templates. This makes it approachable for woodworkers with a range of tools.
Building the Frame
The main structure is assembled by gluing the sides to the base. Clamps are used to hold everything square and secure as the glue dries.
Accuracy here helps ensure the swing arm will pivot smoothly and the base stays balanced. The solid frame sets the foundation for the rest of the build.
Adding Wheels and Hardware
Drew adds wooden wheels to the base, which help lift the structure slightly and improve stability. Although the wheels don’t need to spin, they contribute to the overall look and function.
He also creates wooden bushings to serve as spacers for the counterweight system. These simple components help reduce friction and improve the trebuchet’s performance.
Making the Sling
The sling is built using a durable canvas-like material for strength and flexibility. Grommets are installed at each end to provide reinforced connection points.
It’s then attached to the swing arm in a way that ensures it releases the projectile cleanly. Proper sling placement is key to getting a good launch arc.
Calculating the Counterweight
For the counterweight, Drew uses a combination of lead sinkers to add mass. The counterweight needs to be heavy enough to generate the momentum needed to throw the projectile.
A good ratio is around 133 times the projectile’s weight. This balance helps maximize distance without overloading the structure.
Building Without a CNC
Drew also builds a second trebuchet using a manual process for those without a CNC. He glues printed templates onto plywood and cuts the pieces with a jigsaw.
This alternative approach shows how the same project can be completed with more accessible tools. It opens the build up to more makers regardless of equipment.
Setting Up for Fun
Once the trebuchets are ready, it’s time to set up targets. Stacked soda cans make great castles to knock down and add a fun goal to the game.
The build becomes an activity the whole family can enjoy. It combines creative building with light-hearted competition.
Enjoying the Results
Launching projectiles and adjusting the aim brings excitement to the backyard. Each shot can be fine-tuned by tweaking the angle or adjusting the sling.
It’s a fun way to introduce physics concepts like leverage, gravity, and force. The satisfaction of seeing a can tower fall is a bonus.
Want to See the Full Build?
Get Drew’s plans here: https://fishersshoponline.com/plans/p/fishers-trebuchet
Matt’s Take
These are my personal thoughts and tips based on my own experience in the shop. This section is not written, reviewed, or endorsed by the original creator of this project.
This is one of those builds that perfectly blends woodworking skills with physics fun. The trebuchet mechanism is fascinating – that counterweight ratio Drew mentions (133:1) is crucial for getting good launches. Too light and you won’t get much distance, too heavy and you risk stressing the frame or getting erratic releases.
For anyone tackling this without a CNC, Drew’s template approach is solid. When using a jigsaw for curves like these, a sharp blade and steady feed rate will give you cleaner cuts. Don’t rush the curves – let the blade do the work. If you’re new to template cutting, double-sided tape can help secure your pattern better than just glue, especially on smaller pieces.
Safety-wise, always consider your launch zone before testing. Tennis balls or foam projectiles work great for backyard fun without the risks that come with harder objects. Set up your targets well downrange and make sure everyone knows to stay clear of the swing arm – that counterweight packs serious momentum.
The beauty of this project is how it scales woodworking skills with simple joinery while teaching real physics principles. Plus, there’s something deeply satisfying about launching a projectile with something you built yourself.