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Side view of an onager catapult in the cocked postion showing the arm stop, release  pin, and sling with pouch.
Plan Number OP1-TSM
Catapult Plans
Price $12.95
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Onager Catapult Plans

Build your own Roman Onager with detailed, easy to follow plans and instructions.

When built, this Roman Onager stands 12"  inches tall  in the fired position and will throw a scale projectile up to 50 feet. 

The most powerful artillery piece in the Roman arsenal and a direct descendent of the Mangonel , the sling equipped Onager took its name from the Persian Wild Donkey, because of its powerful "kick" when fired.

Perfect for demonstrating Roman Warfare and technology, this easy to build torsion catapult uses common, inexpensive and easy to find building materials, all available at your local home improvement store. 

This complete catapult plans package includes a shopping list of materials,  measured drawings and dimensions for all parts, step-by-step assembly drawings and instructions, as well as firing and tuning instructions.

Front view of a working model onager catapult in the fired postion showing the arm  against the stop
Rear side view of a torsion catapult in the fired position showing the torsion bundle, arm, release pin, sling, and trigger mechanism.

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