Oh you want me to give away my secrets do you?? :rolleyes: …hehehe
Okay fine…the secret is the sling in the video above is FAKED! The sling itself doesn’t actually affect the projectile, but instead it is driven by several rigid bodies that are hidden. The rigid bodies drive the projectile as well as control a skeletal system in which controls the shape of the sling that is skinned to it. Thats why the sling in the video looks rubbery because skeletal system wasn’t working properly and the joints flipped in on themselves. I’ve been trying to fix that and it looks better now.
Hope that helps you. Good luck with your trebuchet.
Here’s a new highres image just for fun: