Shooting for 27 years, Archery hunting for 20. Started shooting a willow branch with bailing twine as a string. I think I was kicking them out at about 15 fps. The arrows had masking tape fletches with one set at 4 degrees one at 10 degrees and the other was straight fletched. The arrows were tipped with balls of duct tape and my forward of center was somewhere around 50 %. Nock travel depended on the arrow. I remember a couple that would really kick when the knot in the branch would catch the riser. I will bet that my KE was probably around 1/2 foot pounds. Mom still acted like I was going to kill someone with it. Thats why the arrows ended up with balls of duct tape.