Our prototype testing went as we expected it to, due to the lack of a working sling the rock did not fly out and launch like it would with a normal trebuchet. This is something to work on with the final product, as it is a flaw which severly limits our trebuchet's ability. This issue can be fixed by developing a sling mechanism where the rope is released at a certain point to let go of the projectile. We can also change the material used with making the sling, using something sturdy and flexible instead of cloth which clamps the projectile.