Watch this new edit instead, which has a fullspeed ending:    • Launching my 1,000lb Medieval Trebuch...  

Update, April 2020: I realize the slowmotion at the end is not ideal. There are fullspeed clips and more angles of this machine in action in the sequel video:    • Medieval Trebuchet Launches Bowling B...  

Approximately 1,000lbs in the counterweight box, in the form of (20) 50lb sandbags, plus whatever the box weighs empty (later confirmed to be 465 lbs). Launched a 16lb bowling ball 540 feet. The shot went high I'm still working on tuning with the wooden horn and the netted sling. Loading the machine is a LOT of work, and it's scary by yourself. I don't think I will do it solo again, and definitely not at any higher weights. The machine is ready to be tested at higher weights.