Ancient Engineering
Ballistic Technologies of Antiquity
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Catapult Design, Construction and Competition
Catapult Design, Construction and Competition with the Projectile Throwing Engines of the Ancients, and Foreword by Ron Toms. If you've ever wanted to have a catapult or trebuchet competition, then you need this book!
   $19.95  more info

Chinese Siege Warfare
This exciting new book traces the development of Chinese siege engine technology from the 8th century B.C. to the end of the Qing dynasty and makes striking comparisons with siege weapons of other major world civilizations.
   $24.95  more info

Woosh, Boom, Splat, by William Gurstelle
How to build machines such as the Night Ligher 36 Spud Gun, Jam Jar Jet, Elastic Zip Cannon and Vortex Launcher, and more. Including detailed diagrams and supply lists, step-by-step instructions and history too.
   $12.95  more info

Backyard Ballistics, by William Gurstelle
The best book available for backyard fun with things that go boom! Many projects are suitable for science models in schools.
   $14.95  more info

The Art of the Catapult, by William Gurstelle
So you want to build a catapult? This book shows you how to construct some basic types of catapults. Written for the skill level of an average 10 year old, just some simple, basic fun projects that help kids develop mechanical skills and have fun too!
   $12.95  more info

Monster Garage Video
Monster Garage "Special Delivery Van" Video Tape
   $12.95  more info

Nova Medieval Siege DVD
Nova Medieval Siege on DVD
   $21.95  more info

Trebuchet Plans on CD
A big variety of Trebuchet plans in PDF Format on one big CD-ROM, including bonus Onager plans and our E-books too!
   $9.95  more info

Torsion and Tension Catapult Plans CD
Torsion and Tension catapult plans including the Onager, Ballista, Petraria, Mangonel, Scorpion II and a new RatTrap Catapult, plus lots of other useful and interesting information about catapults and model making!
   $8.95  more info
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A catapult is any kind of device that shoots or launches a projectile by mechanical means. In England, a catapult is what we call a slingshot in the US. A catapult is also the part of an aircraft carrier that launches airplanes off the deck.

But for our purposes, a catapult is any of the ancient types of artillery, including Onagers, Scorpions, Trebuchets, Ballistae, Springalds, Coullards, Bricoles Perriers and more.

But most people tend to think of a catapult as the one-armed torsion machine used by the Romans. This is also known as the Onager or Mangonel.


The word Mangonel derives from the ancient Greek word "Manganon", literally meaning "engine of war". The Romans called it a Manganum. In pre-medieval French the word Manganum was changed to Manganeau, and the English changed that to Mangonel in the 1300s.

The history gets a little sketchy in the middle ages, but some historians believe that "mangonel" was shortened to the word "gonnel" about the same time that cannons were being developed, and later still, "gonnel" was shortened to "gun." And still today, in the military a "gun" is strictly a piece of big artillery.


Onager is originally the name for the wild Asian donkey. This donkey bucks like a bronco if anyone gets too close to it, and it is known to kick stones at people and predators too. So when the Romans needed a name for their one-armed torsion catapult, they called it the Onager!

The Onager (catapult) has a single arm that is powered by a large skein of twisted ropes. The ropes were usually made from hair or sinew for their elastic properties.


The word "Trebuchet" is originally French, and meant something like "to fall over or rotate about the middle" as in a see-saw rotating on its axle. It also seems to have meant a big, heavy beam. Today a Trebuchet is any kind of catapult that is powered by a massive counterweight on one end of an arm, and a sling on the other end. This includes Perriers, or "traction" trebuchets which are powered by a mass of people pulling one end of the arm with ropes.


This is a two-armed torsion device invented by the Greeks. It works similar to a crossbow, but instead of a flexible bow, it uses two stiff arms powered by twisted rope skeins like an Onager. The ballista predates the Onager by several centuries and was used to hurl stones (lithobolos style ballista) and also bolts or darts.

Obviously, this is where we get the word "ballistic".