Maybe this thread ought to be Titled "Why MammotHunter Failed Physics but Enjoyed Every Moment of It."Impact ballistics always enticed me, but as you can see, I was never any good at it. so, I've learned something here. I still can't tell you what kind of force the rock imparted to the branch, but what I can tell you is, nobody ought to be standing roughly 1500 metres around Jurek in any direction when he's having a bad day.

I love that sound!
Even though it means your losing power.

Making ballistics gelly is a little more involved than I thought, but if anyone is willing to try he's a link on how.
http://www.recguns.com/Sources/XD3.html

Speaking of impact,
I was slinging yesturday at my range with a friend of mine whom I believe is starting to really enjoy slinging. We started  slinging rocks at the targets, but had to stop because the ammo was disappearing. The rocks were drilling themsleves several inches into the targets. These targets were highly compressed rice straw (3 bales compressed into one smaller one), and were wrapped in a heavy plastic, with of course cardboard as targets.
I was amazed, these targets are fairly new. I helped put them in myself. My friend and I sling a few more stones to make sure we didn't just hit a soft spot.

Larger stones, 3/4 of a tennis ball, could not penatrate,
but roughly golf ball sized stones could,
and small pebbles hardly damaged the cardboard.

This expirence has given me more appreciation for a slings power. After slinging for awhile you forget how fast the stones are going.

-Unsapien

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i can see it happen now people running in fear when Yurek leaves the house in a temper clutching his sling and a sack of stones Lol

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It doesn't seem like something they'd do. They like to do everything themselves.

I'm sure, for some of you  it wouldn't be a big problem to crack that branch or even a thicker one. Besides, there is a significant influence of the mass of stone. For instance, if we are slinging two stones, seratim, a bigger and smaller one, providing to them an identical kinetic energy (in this case the smaller one must be faster: v = quadratic_root(M/m) * V), the bigger stone (M) is able to break thicker and stronger branches. So, looks like the momentum (m * v) is more sinficant factor if you want to break, overturn or crush a target (a penetration is an other quetion).

Saying simply, if a slinger sling a one pound stone with his full strenght (rather slowly due to the big mass), most probably the stone will make a bigger disaster among brunches, than a 2 oz stone slung extremally fast.



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Thank you AjlouniBoy! I also like to watch results of impacts

Birth of a new form of brush clearing?

There is an old medical treatise from the Middle Ages by a doctor named Celsus.
  In it, he states that sometimes the lead glandes would be stuck into the bone so deep, it was impossible to pull it out.
   What he recommended doing is make the wound wider, and cut it out of the bone by cutting a v notch.