I found
pictures from 2002 of a pumpkin chunker names "Sir Chunk-a-lot" .... if that's the same machine, it's a trebuchet, even though it's entered in a generic "catapult" class instead of the specific "trebuchet" class. I'm a bit mystified by the classifications, and looking at the official
Punkin chunkin website doesn't help.
FWIW, the fourth place Air Cannon, "The Great Emancipator" is based in Port Royal, VA ... I watched them shooting it back i mid October.