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Make an Office Supply Catapult
You don't need a whole lot of fancy tools and pieces of wood to make yourself quite a fun little catapult that has some real oompfh to it. This catapult was built strictly out of office supplies (By web visitor Brandon N.) and he has also built a trebuchet!
Brandon has also built an Office Supply Trebuchet! You can see pictures and get the parts list here: The Office Supply Trebuchet
Here are some pictures of his catapult:



Brandon has also built an Office Supply Trebuchet! You can see pictures and get the parts list here:
The Office Supply Trebuchet

Can you make this catapult? You sure can!! Here is a picture of one made by David!
Amazon.com also has a catapult kit you can build

The Desktop Onager: An Awesome all Wood and Twine War Machine
This awesome little machine is the perfect desktop item to enforce the peace in your cubicle or dorm room. It really works!
This all wood and twine machine has no metal parts! Find out how the ancients were able to use nothing but wood and ropes to build machines that could hurl heavy stones great distances.
Simple and easy to build. This kit includes everything you need except for glue and a few simple tools like scissors, sandpaper, a file (a utility knife would be helpful too) and about two or three hours of your time from start to finish.
Designed and made in the USA for better quality, better performance!

Ballista Wood Kit Tre'bu'het: (tré-buh-shay) a fifteenth-century military engine used for hurling heavy weapons and rocks. Made from high quality knot free Basswood, this Ballista is a great addition to any homemade artillery collection. Inspired by Alexander the Great's Artillery of the Macedonian Soldiers, this ballistic firing machine is a working model easily assembled from pre-cut and pre-drilled pieces. Includes laser cut plywood wheels. A fun group or family project, once completed you and your friends and family will be experiencing the thrill of flinging projectiles like those medieval machines, but focusing on height, velocity, and distance rather than on knocking down the enemys fortress. For the truely daring, you can alter characteristics of the trebuchet such as the mass of the clay, the string length, or the amount of the counterweight and can see how the results are affected. You will also see these concepts in action: levers, inertia, counterweights, friction, and more. This kit includes all materials for construction -- Size: 11-1/2" long, 9" wide, and 5-1/2" tall. Ages 16 and up, 10-16 with 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. Note: Please don't propel small mammals, and please don't put anyone's eye out.
BOOKS
Want to build a bigger, better, more powerful or fancier catapult? There are some great books available to you. These books, available at Amazon.com will help take your catapult building to new heights! Pun intended!

Catapult Design, Construction And Competition With the Projectile Throwing Engines of the Ancients

 
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.
Buy from Amazon.com: The Art of the Catapult: Build Greek Ballistae, Roman Onagers, English Trebuchets, and More Ancient Artillery
 
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!
Buy From Amazon.com Backyard Ballistics: Build Potato Cannons, Paper Match Rockets, Cincinnati Fire Kites, Tennis Ball Mortars, and More Dynamite Devices

Whoosh Boom Splat: The Garage Warrior's Guide to Building Projectile Shooters
These are the homemade machines that you've dreamed of building, from the high-voltage Night Lighter 36 spud gun to the Jam Jar Jet, the Marshmallow Shooter, and the Yagua Blowgun. Including detailed diagrams and supply lists, Gurstelle's simple, step-by-step instructions help workshop warriors at any skill level achieve impressively powerful results.

Adventures from the Technology Underground: Catapults, Pulsejets, Rail Guns, Flamethrowers, Tesla Coils, Air Cannons, and the Garage Warriors Who Love Them

Sneaky Uses for Everyday Things: How to Turn a Penny into a Radio, Make a Flood Alarm with an Aspirin, Change Milk into Plastic, Extract Water and Electricity ... a TV with Your Ring, and Other Amazing Feats

Gonzo Gizmos: Projects & Devices to Channel Your Inner Geek - It's possible to use optics to roast a hot dog without electricity or a stove; to make a simple radio with just an iron, a few basic circuits and three shiny pennies; and to assemble a simple steam-powered boat with a plastic bottle, a candle, copper tubing and a nail. Of course, only die-hard science nerds would attempt these projects.

Kits and More Siege Engine Projects
Another Interesting Project: How to Build a Trebuchet
The Trebuchet was a unique siege engine of the middle ages. It was extraordinarily powerful and was easier for military engineers to build because it used gravity as the energy source. I also have a complete project on how to make the Little Dragon Trebuchet.
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