Making catapults, a great project for kids and adults

To give the kids and I something to do while on quarantine we built a couple torsion powered catapults. Pretty sure the proper name for one of these is onager or a mangonel, I'm sure there's a history buff out there that can tell us the difference. At any rate they were fun to build and shoot. It was a good chance to teach the boys a bit about carpentry, science, and math in a hands on way. Thanks for watching, please share, like, and subscribe to the channel!
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Cut sizes and quantity for wood in inches-
16x2 Q-2
6x1.5 Q-5
9x2 Q-2
7.5x2 Q-3
16x1 Q-1
2.5x0.5 Q-1