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Ancient Engineering SeriesONAGER.com
The Mighty Roman War Machine

Mighty Roman ONAGER


This historically accurate, compact and portable catapult uses the exact same principles as the ancient Roman war machines. It is capable of hurling small stones, golf balls, walnuts, eggs, tennis balls and even potatoes from 20 feet up to 100 feet! It all depends on how much power you build into it and the weight of your projectiles. Hand crafted of high quality wood, the kit contains everything you need to build a working model in one evening.*

The ONAGER (also called a Mangonel) uses a bundle of twisted ropes (called a skein) for real torsion power. This torsion engine is so powerful, a full-sized machine can hurl a bowling ball almost 1/4 of a mile!

The finished model stands 16" long, 12" high and 8" wide. The kit is hand crafted from high quality wood and includes a working winch, a real leather sling-pouch and leather strike pads. It has steel capstans (this holds the strong nylon rope skein in tension).

The detailed instructions are complete with diagrams, photos, tuning tips, history notes and web links for even more information about catapults! All parts are pre-cut, pre-drilled and can be assembled to a finished model in one evening.

We've put a lot of time and effort into making this kit as easy and complete as possible. It's a fun way to learn about history and engineering!


* Missiles (projectiles) sold separately.
* Shown stained a dark walnut color. The kit ships as a natural, unfinished wood product.
* Can throw over 100 feet when properly constructed and tuned. Your performance may vary.

WARNING! This is a representative model of a real ancient military weapon. It contains a fast moving arm that can cause injury if you make contact when firing. Use only under adult supervision.

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    Price: $69.00
    Minimum age: 14
    Availability: out of stock

    Item code: 10300

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Interesting Notes

The Roman Onager was the main artillery device of the Roman army. It was named after the Asian Wild Ass because they both have a tendancy to "kick" when they go off.

Oftentimes, an Onager would be fitted with a sling on the end of the arm instead of a cup or bucket. The sling will give greater range to a heavier projectile, but can only hurl one rock at a time. The bucket could be filled with lots of rocks at once - an effective anti-personnel device.

The kinds of things the Romans hurled includes heavy rocks and clay pots filled with pitch and tar- on fire.

Onagers are sometimes called a "Mangonel", but Mangonel literally translates as "War Machine" - a category that also includes ballistae and trebuchets.

The Onagers were used from early Roman times right up to the medieval period alongside the trebuchets. They lost their advantage to the cannons and gunpowder in the 13th century.