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Internal balistics (Read 261 times)
Frondeur
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France
Internal balistics
Jun 8th, 2019 at 11:00am
 
As I was writing about adrasion issues in the "cordage" topic, I remember an experiment I made some times ago:

using a fragile polypro Tut-ish sling with abrasive, pink-painted stones;
One or two hundreds of throws, maybe more, sidearms and overhand.

Here's the result.
Note that I'm right-handed.
you can see the point where the stone puhes the pouch to open the sling.
As I remember, during the first throws, the black side of the pouch took all the pain, witch I interpretated as a wrong palm angle during the cast. I tried to correct this, and abrasion became gradually more even.
Note the pink coloration of the release cord, going up the pouch for more than 15cm. This cord also bears the marks of some "misfires", ie unwanted interractions beween de stone and the cord. the whip was even half cut.

Has somebody tried something similar?
I definely shall conduct this kind of experiment again, using various kind of ammo...
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Rat Man
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Slinging Rocks!

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Re: Internal balistics
Reply #1 - Jun 8th, 2019 at 9:17pm
 
   I generally tie about three inches of West Country Whipping on either side of the pouch to protect the cords.  This doesn't seem to affect the performance of the sling at all.
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Kick
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Re: Internal balistics
Reply #2 - Jun 9th, 2019 at 3:03am
 
I don't usually bother putting any protection but then again I mostly use tennis balls and, when I do use stones, I use very smooth rounded ones. These will eventually wear out a sling as well but not nearly as quickly.
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Tomas
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Re: Internal balistics
Reply #3 - Jun 9th, 2019 at 8:48am
 
Seems about right. My own sling has a similar wear pattern.
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joe_meadmaker
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Re: Internal balistics
Reply #4 - Jun 9th, 2019 at 9:57am
 
I have seen this as well.  Like Kick, I tend to use ammunition that isn't very damaging to the sling.  But I have several apple trees in my yard.  And later in the year when the apples start to fall, I sling anything the deer don't eat out into the bushes.  I've definitely seen the first several inches of the release cord get a little "gunked up".
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woodssj
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That lake isn't going
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Re: Internal balistics
Reply #5 - Jun 13th, 2019 at 9:17am
 
I've seen this type of wear as well, but I've never taken the time to count throws before it gets there. That seems to depend on the sling and ammo combination, which is quite varied for me
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Confused Archaeologists are the best Archaeologists.
 
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