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.

Machines

Power Source

Two Torsion Bundles

Advantages over Ballista

• More arm rotation

Disadvantages over Ballista

• Larger frame
• No supports between bundles

Pictures