The torsion catapult was a more sophisticated design. It was powered by springs made from tightly wound rope or animal sinew, said Cuomo.

The torsion catapult was a more sophisticated design. It was powered by springs made from tightly wound rope or animal sinew, said Cuomo.

A team of engineers at Wright Patterson Air Force Base, led by David Mollenhauer, senior materials engineer at the base, takes the sport pretty seriously. Called Team ETHOS, the crew has been at its ...

A torsion catapult is based on a classical Greek design that uses rope wrapped around two posts (see photo). The throwing arm goes inside the loop created by the rope. The lever pulls back, twisting ...

Team Carbo took second place in the adult torsion catapult division at the last world championship, held in Delaware in 2016. There, the Onager produced a throw of 2,786 feet.