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 arm positions and movements resemble a crossbow.

Machines

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

Pictures