The Under-Pult Upside down Catapult

Here is a picture of the completed Undepult

This graphic shows you exactly how the underpult works. Rather than throwing the projectile from the top it throws from the bottom.

But this kind of a catapult setup causes a bit of a problem. The graphic here shows that. When you draw back the throw arm to fire it the projectile is going to fall right out of the cup! So, we have to design something to fix this. We want the projectile to be held in the cup with the throw arm drawn back but we want the projectile to freely release at the point of fire.

To solve this problem I created a little setup called The Caddy. It holds the projectile throughout the swing of the arm yet lets it release freely.

It's a little bucket that hinges on the swing arm. You can see the clay projectile ball in the caddy.

This picture shows the caddy in the loaded position. The tension is now on and it just needs to be released to fire. See how the caddy stays horizontal and hold the projectile in place?

And this picture shows the catapult just at the moment of fire. The throw arm slaps directly against the stop. This holds the caddy tightly in position and releases the projectile to fire.

I have a video showing this catapult. You can learn more about it and see how it works right here:

Amazon.com Has Catapults

The Desktop Onager: An Awesome all Wood and Twine War Machine - Fiercely Fend Off Office Rivals -- Conveniently sized to sit on your desk, this intimidating little machine is an actual working reproduction of an onager. -- The weapon is all wood and twine with no metal parts, but it packs a big punch. Load it up with the included wooden balls or get creative with marshmallows, coffee creamers, erasers and more to see how many cubicles they can soar above before landing. -- Properly constructed, the onager has a range from 10 to 20 feet. The ancients were able to use nothing but wood and ropes to build machines that could hurl heavy stones great distances, now you can do the same to enforce peace in your office or dorm room. -- Build it yourself in under three hours, because this kit includes everything you need except for glue and a few simple tools like scissors, sandpaper, and a file. Colors may vary. -- Warning: This is a representative model of a real ancient military weapon. Use only with competent adult supervision.

Catapult Kit Lay Siege To The Doghouse! Right after you build your own working medieval catapult. All you'll need is glue, scissors and a steady hand to construct this wooden, Canadian-made siege engine kit. The finished catapult stands 6" tall x 5" wide x 10" long and will toss assorted stuff (meatballs?) 15 feet or further, depending upon the stuff. Comes with detailed instructions.

NOVA: Medieval Siege - The Scots inside Stirling Castle must have felt untouchable. Protected by a massive stone fortress, they prepared for a long drawn-out siege against the army of England's Edward the First. Fifty carpenters worked day and night to create the fourteenth century version of the atom bomb: the trebuchet-a fearsome, gravity-powered catapult dubbed "Warwolf" that was capable of hurling boulders, bee hives and plague-infected corpses long distances. Travel back to the Middle Ages and relive a fascinating turning point in warfare and medieval history.

- Enter the battlefield and experience the chaos of medieval warfare-200 years before the invention of the cannon
- Discover how the mechanized catapult sent English history and warfare in different directions
- Enter gigantic medieval castles and explore why these mighty fortresses became vulnerable to the "Warwolf"
- See how the medieval manuscripts provided clues in the trebuchet mystery
- See medieval experts create two competing full-scale catapults
- Travel to the banks of Loch Ness as newly designed catapults attempt to destroy a castle wall with 250 pound stone balls

The Catapult Projects

New Catapult Project This is "The Ogre" and it is built from 2x3's and uses a bungee cord for power. The base is two feet long and you can get a sense of the size by the safety goggles in the picture. It took me about two hours to build this catapult and I am making complete plans so you can build one too. This is not a toy! And you must wear safety glasses when building and when using it. Doesn't take a lot to build though, just some wood, a bungee cord a couple of hooks and some tools like a saw and drill. The plans and tutorial are here so you can check in and see my progress

The Wyvern Torsion catapult
Complete project with step by step assembly instructions, blueprints and a video for making this powerful 3 foot catapult. It uses twisted rope for torsion. This type of catapult is called a Mangonel.The Wyvern Catapult

New Catapult Project This Catapult is called "The Goblin" It has some design improvements and is very powerful. This is currently a working prototype. I will be making plans available and also selling kits for this catapult. The base is ten inches long.

The Official Miniature Catapult This is The Table Top Troll catapult takes a little time to build but it really will come out great. It is a nice project and involves a bit of woodworking.

The Teeny-Tiny Popsicle Stick Catapult - The Hobbit Fun little project that comes with a video of me shooting a projectile into a Lord of the Rings Mug. This little catapult is great for having little competitions with friends. Build two and make a game of this project.

The Popsicle Stick Catapult - This is a fun catapult project that shows the strength of the triangle. The triangle is a shape that is often used in architecture because of its strength. Geodesic domes like the EPCOT center use the geodesic triangle shape. 30 minutes and 32 popsicle sticks.

Looking for Free Plans to Build A Catapult? Here is a complete drawing that shows you how to build a small catapult. It is the plans for the Table Top Troll. You can print out these plans and use them. free plans to build a catapult

How not to build a catapult - I attempted to build a mangonel style catapult that uses twisted rope as a way to store the kinetic energy. It didn't work out well but still has potential. Here is a bit more about the project.

Use the Teeny-Tiny popsicle stick catapult to make this game called Storm The Castle ! See the Project here

Catapults Submitted by Web Visitors Lots more of these here

Here are some catapults built by people who have sent me the pictures.

The Easy catapult. This is a great example of making a catapult without using any nails or glue and creating a neat little catapult to have fun with! The Easy Catapult

The History of Catapults

The Engineering of Catapults - The basic concept of the catapult is not an arm that fires a rock. The basic concept of the catapult is using any means available to store a lot of energy then in one quick release of that energy to fire a heavy projectile a long distance.

Catapult Videos

Catapult Kits to build your own Catapult

Books about Catapults, and Making Catapults

Web Resources for Making Catapults

Web Links to All sorts of Catapult Stuff

Unusual and Unique Catapult Stuff

Want to build a bigger, better, more powerful or fancier siege engine? There are some great books available to you. These books, available at Amazon.com, will help take your trebuchet or catapult building to new heights! Pun intended!

Whoosh Boom Splat: The Garage Warrior's Guide to Building Projectile Shooters

The Art of the Catapult: Build Greek Ballistae, Roman Onagers, English Trebuchets, and More Ancient Artillery - Nice book that shows you how to build ten different catapult projects, moderate wood working and pvc piping kind of stuff. Good book with complete instructions and materials lists.

Backyard Ballistics: Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Devices Want to get a little more creative? This book is off the hook!

15 Dangerously Mad Projects for the Evil Genius

This wickedly inventive guide explains how to design and build 15 fiendishly fun electronics projects. Filled with photos and illustrations, 15 Dangerously Mad Projects for the Evil Genius includes step-by-step directions, as well as a construction primer for those who are new to electronics projects.

Using easy-to-find components and equipment, this do-it-yourself book shows you how to create a variety of mischievous gadgets, such as a remote-controlled laser, motorized multicolored LEDs that write in the air, and a surveillance robot. You'll also learn to use the highly popular Arduino microcontroller board with three of the projects.

Do you like making projects and exploring a variety of hobbies?

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Table of Contents for this tutorial

BACK TO THE CATAPULT MAIN PAGE

1. Make the Table Top Troll Catapult Home and materials requred
2. Begin assembly of the sides and base
3. Assemble the catapult firing arm
4. Complete the assemblly and finish by painting
5. Video of this catapult firing
6. Books/Medieval store
7. DVD's Documentaries about siege engines
8. Free Catapult Plan

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