After the winch operated cannon and the "Ballista" slingshot, The Slingshot Channel continues to combine medieval siege engine technology with modern rubber. This time, a long throwing arm is powered by a lot of pre-tensed rubber. The weapon is cocked much like a break barrel air rifle, and then a 20 mm steel ball is put on the "spoon" shaped end of the lever, held in place by a neodyme magnet.
The trigger works much like on a crossbow or firearm.
The video includes impressive super slow motions of the shot, recorded at 1200 fps with the Casio EX-F1 Pro camera.
http://www.youtube.com/watch?v=n9CmyIn8ffI