The title of this youtube video is "How to Build a Supersonic Trebuchet." However, the inventor, Dave Eade, is correct to say in his description that this hurling machine might technically not be a true trebuchet. It should be put in the centrifugal class of catapults under the World Championship Punkin Chunkin rules. Their rules say: "To qualify (as Centrifugal Class), a machine shall spin at least one (1) revolution before releasing their pumpkin." Yes, centrifugal class times 50+, indeed.
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Reference:hackaday.com:
SUPERSONIC PROJECTILE EXCEEDS ENGINEERS DREAMS: THE SUPERSONIC TREBUCHET
