Hatra Ballista

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 arms swing between the bundles.


Power Source

Two Torsion Bundles

Advantages over Ballista

  • More arm rotation

Disadvantages over Ballista

  • Larger frame
  • No supports between bundles


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