Some pretty good penetration results Xenon! Particle board is no match for a sling.....try 3/4" plywood. Plywood, as CA said, is some tough stuff! In the video, some may note that old Goliath had alot of give up top as well, which does absorb a considerable amount of impact force from stones nearly the size of one's fist. Lead spheres or darts would make it look like rice paper.
Quote:If the same mass of rock were shaped like an arrow, it would go through several Goliaths.
Pancaker, you got that right! I wish I could find that VHS tape of a sling session I did back in '88. On it, is a demonstration comparison between a compound bow and my Pro-Grip sling. I used a sheet of 3/4" CDX plywood for the back stop with, if memory serves, a sheet of 1/2" plywood 4' behind it to catch my bearings. (punny, I know, Dale) I shot into the front sheet with the bow from about 10 meters with the arrows penetrating to a fairly wide degree of depths into the first sheet. I then proceeded to sling 1" steel ball bearings through the first and sometimes second sheet.
If I had bothered to video some of my 6oz. field tipped dart casts through an old '73 Chrysler dinosaur.....well, my excuse is, I was 21yrs old and slinging failed to compete with other interests of the day.
TS