Ancient Engineering
The Atomic Bomb of the Middle Ages

STEM projects make a better world:

Science, Technology, Engineering, Math. (STEM) It's the very foundation of our modern world. Without inventors, theorists, engineers and scientists, we'd still be living in the stone age, and the challenges facing our world today make STEM skills even more important than ever. Hands-on experience with real-world projects gives kids a kick-start on life too. It shows them that math and science are more than just abstract equations on paper, they have applications in the real world that are exciting, fun and important. It gets the kids outdoors, away from the TV and video games, and it is great mental cross training regardless of what field of work they eventually go into. Our kids are the future, and smarter kids make a better future for everyone. Help make a better world. Get a kid started with a STEM project today.

Choose from these great STEM projects for your kids:

Mini Floating Arm Trebuchet
This MINI version of our Floating Arm Trebuchet can snap together in under ten minutes and requires NO GLUE! This has been our TOP SELLING trebuchet since 2012.


The EZ assembly Tabletop Trebuchet
Here's a snap-together trebuchet kit that's perfect for office warfare or household floor-wars! With our precision made kits, you can assemble your own trebuchet in mere minutes and start flinging missiles at your unsuspecting victims. Huzzah!

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Medieval Siege Set
Here's a great companion set to your favorite Trebuchet model. No medieval battle is complete without a battering ram and a siege tower to breach the castle. These kits are the perfect complement to your medieval arsenal of destruction!

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The Mighty Roman Onager
This display-quality model really works and can shoot missiles up to twenty feet. The perfect desktop item to enforce the peace in your cubicle or dorm room. No springs! Historically accurate twine skeins power the onager kit just like the ancient machines. Hurls the included wooden balls up to twenty feet across the room.

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Buy the Book
The Big Book of Catapult and Trebuchet PLANS!
This book is chock-full of detailed plas for building a variety of trebuchets and catapult projects. Includes notes on scaling, materials, history and of course, the all improtant safety warnings. If you want to build hurling machines for your backard battles or just general defense, this book is for you!

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Interesting Notes

Some Trebuchet History:

From the 13th century writing: "Itinerarium Peregrinorum et Gesta Regis Ricardi"

In June and July of 1191, Richard the Lionheart (the Duke of Normandy) laid siege to the city of Acre as part of the medieval Crusades.

The Duke concentrated on constructing siege machines and placing trebuchets [petrariae - literally, stone hurler] in suitable places. He arranged for these to shoot continually day and night. He had one excellent one which he called "Bad Neighbor" [Malvoisine]. Its continual bombardment partly destroyed the main city wall and shattered the Cursed Tower. On one side the Templars' trebuchet wreaked impressive devastation, while the Hospitallers trebuchet also never ceased hurling, to the terror of the Turks.

Besides these, there was a trebuchet that had been constructed at general expense, which they called "God's Stone-Thrower". A priest, a man of great probity, always stood next to it preaching and collecting money for its continual repair and for hiring people to gather the stones for its ammunition. This machine at last demolished the wall next to the Cursed Tower for around two perches' Length [11 yards or 10 meters].

The count of Flanders had had a choice trebuchet, which King Richard had after his death, as well as another trebuchet which was not so good. These two constantly bombarded the tower next to a gate which the Turks frequently used, until the tower was half-demolished. Besides these, King Richard had two new ones made with remarkable workmanship and material which would hit the intended target no matter how far off it was. . . . He also had two mangonels [traction trebuchets] prepared. One of these was so swift and violent that its shots reached the inner streets of the city meat market.

King Richard's trebuchets hurled constantly by day and night. It can be firmly stated that one of them killed twelve men with a single stone. That stone was sent for Saladin to see, with messengers who said that the diabolical king of England had brought from Messina, a city he had captured, sea flint and the smoothest stones to punish the Saracens. Nothing could withstand their blows; everything was crushed or reduced to dust.