The counterweight is dropped, swinging the beam toward the target. The sling, with the rock in it, is whipped skyward and forward. When the counterweight hits the bottom, the beam stops moving. The sling keeps moving skyward and forward. It swings the rock forward on a second axis multiplying the centrifugal force. When the rock approaches the apex of arc, the release pin is triggered. This lets go of one end of the sling, allowing the rock to fly free.
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A trebuchet is defined as a machine used in medieval siege warfare for hurling large stones or other missiles. The first trebuchet was invented by the Chinese in the 4th century BC.
A trebuchet is a medieval siege weapon. Some trebuchets were very large and could throw very heavy objects over the walls of castles. There is a link below to an article with more information.
trebuchet
The oldest documentation of traction trebuchets date back to China in the 4th century BC. The first record of counterweight trebuchets comes from an Islamic scholar in 1187 AD.
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