Buy it now and start your kid's journey to making something great! The Roman empire's onager catapult used torsion—twisting an object, in this case a restraining rope or spring, by applying ...

Although the catapult can launch a person 20 feet high and 50 feet away, that’s not good enough for Bell. He plans to retrofit the device with lightweight aluminum parts so its piston can fling ...

But Sulich’s interest lies a few steps away, in a concrete-and-steel trench more than 300 feet long, where a new catapult, also aimed down the runway, is under construction. When complete in ...

The catapult mechanism, also known as a lever, was, and still is, used to lift and move objects. If you have ever tossed a ball or played on a seesaw you have experienced the power of a lever.