Torsion powered device using two arms connected by a bow string and turned by a high tension twisted bundles of rope called a skeins. Ballista can throw stones (Balls), or arrows. The arm positions and movements resemble a crossbow.


Power Source

Two Torsion Bundles

Advantages over Onagers

  • Can be aimed simply
  • Can not throw backwards
  • Can throw Arrows

Disadvantages over Onagers

  • Complicated
  • Hard to build


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