The Yankee Siege trebuchet was the most visually striking of all the chunking machines. A trebuchet uses gravity as its source of energy. The big box thing is cranked up by hand. When the weight drops it whips around the throwing arm holding the pumpkin. Yankee Siege won last year with a chunk of 1394 feet. The toss I saw on Saturday traveled 1340 feet or so (see the action sequence on Flickr).
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