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Compound sling vid (Read 1313 times)
joe_meadmaker
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Re: Compound sling vid
Reply #30 - Jun 25th, 2019 at 10:47am
 
@
NooneOfConsequence

That's genius!† And I think it could definitely work for a compound sling.† I may need to make a completely new sling to try and incorporate this pouch, but that will be next on the list.† Thanks for posting!† Cheesy
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joe_meadmaker
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Re: Compound sling vid
Reply #31 - Jul 6th, 2019 at 2:17pm
 
Compound sling revision 3.† This version has the pouch designed by NooneOfConsequence incorporated.† You can see an image of his pouch earlier in this topic.

I made one small change.† To the retention cord that wraps around the projectile while it's in the pouch, I added a small leather tab.† The intention is to create more surface area for the cord when it's pushing the ball out of the pouch.† Here are some images with an orange ball held in the pouch as a projectile:

......


And here is the full sling:

...

The primary retention cord is paracord.† The secondary retention cord is braided linen.† And the release cord is also braided linen.† The booster-weight is the same thing I used in my previous versions of this sling, it's a plastic ball filled with silicone.† It weighs approximately 130 g.

Now on to the most important thing, how well does it work?† I'm not yet certain, but I think shows promise.† I've only done 6 or 7 throws, which I tried to record, but it's so hot and humid that my phone just quit recording.† I also had the angle wrong, so I wasn't even in the frame for most of the video.† Needless to say I just deleted it and will record another.

I was planning to do another recording right away, but a little rain came through and bumped the humidity up from 100% to what feels like 120%, so I'm not doing it today.† But a video of this thing in action will be coming soon.

The only real feedback I have at this point is that the pouch may not be releasing the ball as cleanly as I would like.† But if that turns out to be the case, I have a few ideas that may help.
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NooneOfConsequence
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Re: Compound sling vid
Reply #32 - Jul 7th, 2019 at 10:33pm
 
Very nice!  I noticed on my first few prototypes that the ring pouch works better with just a little slack. If itís too tight around the ball, you will get inconsistencies in the release.
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joe_meadmaker
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Re: Compound sling vid
Reply #33 - Jul 16th, 2019 at 7:33pm
 
Here is the video of version #3.† There has definitely been some good progress.† The sling in this video is the one pictured in the post above, with the pouch design from NooneOfConsequence.

Some thoughts on this version of the sling.† I like this pouch design much better than the one I was using.† It works using the same concept, to hold the projectile in place until the sling is released.† It just does it way better!† The throws feel much more controlled than the version #2 sling.

That being said, I believe the release of the projectile is still the biggest problem.† I'm going to make one more sling (at least that's the current plan Wink) to incorporate three more pouch adjustments.† One will be to make it with a thicker material so it's a bit stiffer.† The second is to make it just slightly larger so the ball will come out easier.† And the third change will need to wait, because it's a little difficult to explain without picture.† Once the sling is ready, I'll post photos to show what was done.

Check out the video and let me know what you guys think.

https://youtu.be/Ih8IH7gge6g
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joe_meadmaker
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Re: Compound sling vid
Reply #34 - Jul 16th, 2019 at 7:41pm
 
Oh, almost forgot.† Just to give an idea of distance, most of the throws are in the 20-30 meter range.† Although that's a very rough estimate because I only paced it off.† But as you can see, I'm just kind of lobbing them without much power at all.
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NooneOfConsequence
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Re: Compound sling vid
Reply #35 - Jul 17th, 2019 at 8:03pm
 
Nicely done Joe!

Whatís the mass ratio for the counter weight versus the ball? And how long is your second stage compared to the first?† Iíll bet we could do some modeling and parameter optimization in the maths section.
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« Last Edit: Jul 17th, 2019 at 9:08pm by NooneOfConsequence »  
 
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joe_meadmaker
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Re: Compound sling vid
Reply #36 - Jul 17th, 2019 at 10:02pm
 
Thanks!

The projectile ball is 50g.† The weighted ball is about 135g.† The ball I'm throwing is just a plastic street hockey ball.† I think a golf ball would work better, but I'm still not completely confident that every throw will go forward.† My house is usually behind me or to the side when I'm slinging, and I don't want a golf ball flying toward it at high speed.

The length of the main retention cord from the finger loop to the center of the weighed ball is approximately 54.5 inches (138.4 cm).† Once the sling is laid out, the length from the finger loop to center pouch (with the projectile still loaded) is approximately 74 inches (188 cm).† As the video shows, this thing really wraps you up after a throw.† Smiley
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