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Leaping sling pouch (Read 1050 times)
thabaill
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Leaping sling pouch
Mar 27th, 2024 at 1:55pm
 
Hi. I remember I have seen a video on Youtube several years ago where two teenagers were casting stones to a cliff wall.

The interesting subject is they had slings made in a way the pouch or stone cradle was concave when they have the stone there, but when they released the cord and the sling opened the pouch became a little convex, so the stone leaped a bit.

Someone else remember to have seen that video or such type of sling?

Greetings and thanks in advance!
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joe_meadmaker
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Re: Leaping sling pouch
Reply #1 - Mar 27th, 2024 at 9:02pm
 
I don't remember seeing that.  But now I want to!  Smiley
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thabaill
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Re: Leaping sling pouch
Reply #2 - Mar 28th, 2024 at 3:28pm
 
I have been looking for the video again many times but I cannot find it  Embarrassed Cry

I remember the sling was somewhat like an ancient Egyptian one. The pouch for the stone was made in a way it flipped from concave to convex when the release string became loose at the moment when the user fired the stone.

I am sorry I neither can find the video nor have a better description or more detail.
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Wide Right
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Re: Leaping sling pouch
Reply #3 - Mar 29th, 2024 at 4:22am
 
I came across some pictures on here not too long ago of someone who achieved an effect like that by looping a rubber band around the retention and release cords and behind the pouch, so that when let free the band compressed and the pouch rapidly flipped open. In their case I believe it was an experiment in giving the release cord some extra opening speed, basically an "assisted opening sling" if you will. Not quite the same thing as what you're talking about, but pretty similar.

Whether or not it had any tangible effect on their throw I can't recall. Just spitballing here, but my thoughts are that any pouch that was made in such a way as to push itself open through forces beyond just the normal centrifugal action, would likely not spiral the projectile as well or potentially even impact the projectile as it exited the pouch, doing strange things to its flight characteristics.

But who knows! Maybe it would do something cool. I hope you're able to figure out the kind of sling it was and replicate it, if so please let us know how it works!
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Re: Leaping sling pouch
Reply #4 - Mar 29th, 2024 at 10:04am
 
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kairo
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Re: Leaping sling pouch
Reply #5 - Mar 29th, 2024 at 1:07pm
 
That might really have potential! Like, if you make the cords themselves out of rubber,  and maybe use a sort of handle and attach them to that, this could even boost power. Practically a rubber-assisted Hoopak staff sling hybrid. I actually think that's the future of precision slinging XD
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Re: Leaping sling pouch
Reply #6 - Mar 29th, 2024 at 2:03pm
 
It's not like I saw it but the idea is interesting and innovative.   Grin
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IronGoober
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Re: Leaping sling pouch
Reply #7 - Mar 29th, 2024 at 8:38pm
 
kairo wrote on Mar 29th, 2024 at 1:07pm:
That might really have potential! Like, if you make the cords themselves out of rubber,  and maybe use a sort of handle and attach them to that, this could even boost power. Practically a rubber-assisted Hoopak staff sling hybrid. I actually think that's the future of precision slinging XD

You better watch yourself around here... you're playing with fire  Grin Grin
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joe_meadmaker
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Re: Leaping sling pouch
Reply #8 - Mar 29th, 2024 at 11:25pm
 
IronGoober wrote on Mar 29th, 2024 at 8:38pm:
You better watch yourself around here... you're playing with fire  

This!  Grin
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Re: Leaping sling pouch
Reply #9 - Mar 30th, 2024 at 4:37am
 
I'm just wondering whether traditional braided rubber bands made of natural rubber comply with Balearic regulations. 😜🤭😂🤓
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thabaill
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Re: Leaping sling pouch
Reply #10 - Mar 30th, 2024 at 9:44am
 
Hi everybody.

Two weeks ago I made a slingshot for little child. He is only 3 and already he is starting to get immersed in Matrix/smartphones. The rubber bands aren't great. But the ones I got which are powerful tear just after a few shots. Anyway I am sure the little boy will never be allowed to use it. It will finish hung on a garage wall as a curious thing from a recent past or thrown to the trash in a rush cleaning.

I was not thinking exactly about a shepherd sling with rubber bands or a halfling hoopak Grin

The power added by a flipping, leaping or popping stone sling pouch would be negligible. But my interest is more aimed toward reducing the friction or avoiding completely the relese cord touch the stone once fired. Just as IronGoober says here https://slinging.org/forum/YaBB.pl?num=1613167640/11

I saw Sarosh post https://slinging.org/forum/YaBB.pl?num=1709755717 which is very interesting.

I use to see many times rifling spiraling wonderful shots but also Magnus effect menay times. So my interest is more aimed to achieving this:

"the missile may not fly out at random, from the pliancy of the strap at the moment of discharge, but, seated firmly while being whirled, may be shot out as if from a bow-string."

"the loose band does not roll about in the throwing of a bullet, but balanced when it sits, as if it were shaken by a mass of strings."

Greetings!
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kairo
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Re: Leaping sling pouch
Reply #11 - Mar 30th, 2024 at 4:24pm
 
Hehe yeah I was just joking ^^
The construction of the sling has an influence on this. In general, you want cords that are stiff in one direction, and pliable in the other. That way the cords allow controlling the orientation of the pouch until the release, and they open up easily during the release. The rectangular cross-section of Balearic slings provides this kind of stiffness, as do flat woven cords or straps of leather. Also, imagine to pull the cords of a Balearic sling apart. How does the split pouch move? Exactly how you describe.
There are many ways to achive this desired behavior when constructing a sling, and many ways to fail ^^ Still, this won't do magic, and it takes much training to eventually be able to make use of this.

From where are the citations you quoted?
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thabaill
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Re: Leaping sling pouch
Reply #12 - Mar 31st, 2024 at 4:26pm
 
Hi kairo. I know you were joking  Wink Tongue Grin

I got the quotes from Livy's description of the Achaean sling. The first one is the official translation. The second is the translation I get from Google. It is slightly different and it says nothing about a bow string.

In Southern Spain the type of sling used is the same as nowadays Balearics, so I have the trend to think in slings as braids. I my zone rocks are mainly sandstone which it very light. So I must use a bit large stones that roll on the sling and get a lot of Magnus effect. That is the reason I use to think, sometimes even obsessively in how was the actual Achaean sling.

My goal it to get a pre-opened sling or one made in such way that it has the tendency to open once released while it still holds the stone firmly when whirling it. But without the assistance of rubber bands or anything modern.

Greetings.
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kairo
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Re: Leaping sling pouch
Reply #13 - Apr 1st, 2024 at 3:24pm
 
Thanks!
So, Balearic slings don't work well for you? I often sling tennisballs with a Balearic, and as they are quite low in density I think they might be comparable to your sandstones.
If the Magnus effect impairs your accuracy, I guess instead of trying to eliminate friction and spin, you should rather try to improve your control over pouch orientation. With a spin parallel to the axis of flight, there's no Magnus effect.
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Re: Leaping sling pouch
Reply #14 - Apr 1st, 2024 at 8:48pm
 
What is a pre-opened sling? I do not understand the problem. There are perfect stones in Ibiza. But they break very quickly and are very light. There are no problems with it.
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