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Yo-yo Discus Sling (Read 997 times)
Jauke
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Re: Yo-yo Discus Sling
Reply #30 - Jun 25th, 2020 at 12:25am
 
Way of the Sling wrote on Jun 24th, 2020 at 5:08pm:
Jauke wrote on Jun 24th, 2020 at 1:21pm:
Some of my clay projectiles didn't make it far though, they just snapped in halve. These had the inside cillender made too small. Sun dried clay isn't so strong. Others thought it would be more fun to fly vertical

I've had exactly the same problem, and I think it's because the cord pulls on the sides causing them to break. I imagine that wouldn't be an issue though If they were fired. The clay 'discus' shaped projectiles in the Y sling look much more promising though, and I think that is the best route to take. I've found they are actually easier and quicker to make than traditional glandes as well.


Have you tried throwing them into great distance with the Y-sling?
You could make a discuss sling for disks without a groove, but the sling itself would become a lot more complex. I think this simple 1 cord solution is perfect
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Jauke
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Re: Yo-yo Discus Sling
Reply #31 - Jun 25th, 2020 at 12:28am
 
nice Timpa.. of course you have done it already  Cheesy
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cwoodham
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Re: Yo-yo Discus Sling
Reply #32 - Jun 25th, 2020 at 9:50am
 
It would be interesting to see if you could get any flight benefit from a Frisbee shape? I made a quick model of what I'm thinking could fly a far distance if made out of metal.

Currently the Frisbee part is 6in in diameter and is about 4.6 cubic inches and the ball end is 3in in diameter and 2.3ish cubic inches. I imagine the mass would need to be equal about the stem so a different metal for top and bottom?

The groves promote spin as well as being concave so rope or a flat web would have more contact.

Let me know if the image works, I dont post often Smiley
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Curious Aardvark
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Re: Yo-yo Discus Sling
Reply #33 - Jun 25th, 2020 at 10:24am
 
that would probably fly in a circle if it flew.

interesting to try though - can you export it as an .stl ?
It would print pretty easily.†

But shrunk down for slinging.

Balancing it on a cord would be 'interesting' - though I suspect 'frustrating' is a better word Smiley
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Do All things with Honour and Generosity: Regret Nothing, Envy None, Apologise Seldom and Bow your head to No One †- works for me Smiley
 
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Jauke
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Re: Yo-yo Discus Sling
Reply #34 - Jun 25th, 2020 at 4:53pm
 
The groves remind me of a rifled barrel
Very interesting Cwoodham

Now something more immediately attainable:

Golfball with groove

I am going to make the groove a little deeper and wider as opposed to this picture but you get the idea

Will see how it flies tomorrow
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''He leads the humble in what is right,
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cwoodham
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Re: Yo-yo Discus Sling
Reply #35 - Jun 25th, 2020 at 8:08pm
 
Curious Aardvark, I think the issue of balancing on the string part would go away if I could work the moments out to be equal on the center of the stem. Either a different mass material for either side or a new geometry... doesn't mean it won't just tumble out like you said.

Its a rhino file right now but I could definitely convert and send it as an .stl if I can figure that out, would be cool to see someone try it (Update: wont let me post the .stl file Sad )
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Re: Yo-yo Discus Sling
Reply #36 - Jun 26th, 2020 at 12:11am
 
cwoodham wrote on Jun 25th, 2020 at 8:08pm:
Curious Aardvark, I think the issue of balancing on the string part would go away if I could work the moments out to be equal on the center of the stem. Either a different mass material for either side or a new geometry... doesn't mean it won't just tumble out like you said.

Its a rhino file right now but I could definitely convert and send it as an .stl if I can figure that out, would be cool to see someone try it (Update: wont let me post the .stl file Sad )



I agree that it could work. Anyone ever have one of these? I did. Not a great flyer, but it did fly....
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Jauke
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Re: Yo-yo Discus Sling
Reply #37 - Jun 26th, 2020 at 5:23am
 
Well, that was the furthest golf ball throw I ever did

I got no exact distance since it flew so far I could no longer see it, it disappeared on the horizon
But I know it flew over a tree and that tree is 240 meters away according to google maps so I know it flew at least that far.

This was throwing without fancy piroutte or a run up, it was just from a stand still position throwing sidearm with a 75 cm sling.

But I did have Dutch winds in my favour.
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''He leads the humble in what is right,
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Curious Aardvark
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Re: Yo-yo Discus Sling
Reply #38 - Jun 26th, 2020 at 7:18am
 
did the golfball fly straight ?

Longest throw i ever saw, was a golfball at the golfclub in powell, wyoming.

Larry bray put one over the fence at the end of the driving range - and it was still rising at that point. we have no idea how far it actually went.

BUT !
I personally have never been able to throw a golfball straight Smiley
The spin makes them curve. I can put a right angle bend in a golfball flight. but long distance and straight - damn near impossible lol

So if your's flew straight, it either didn't spin, you managed an overhand throw or the groove totally messed up the aerodynamic effect of the dimples.

Interesting.
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Do All things with Honour and Generosity: Regret Nothing, Envy None, Apologise Seldom and Bow your head to No One †- works for me Smiley
 
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Curious Aardvark
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Re: Yo-yo Discus Sling
Reply #39 - Jun 26th, 2020 at 7:24am
 
cwoodham wrote on Jun 25th, 2020 at 8:08pm:
Curious Aardvark, I think the issue of balancing on the string part would go away if I could work the moments out to be equal on the center of the stem. Either a different mass material for either side or a new geometry... doesn't mean it won't just tumble out like you said.

Its a rhino file right now but I could definitely convert and send it as an .stl if I can figure that out, would be cool to see someone try it (Update: wont let me post the .stl file Sad )


hang on I'll add stls to the allowed file list..
right try that Smiley

Was thinking you could change the toothed section to a 2 mm groove - not too deep or it won't print. But then i thought - I've got a bunch of 6mm toothed 3d printer belt - maybe make a sling from that. Hell I can even print my own toothed belts.
Did that for the rotary axis I made for my laser cutter

Anyway hopefully stl's will post now Smiley
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Do All things with Honour and Generosity: Regret Nothing, Envy None, Apologise Seldom and Bow your head to No One †- works for me Smiley
 
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Jauke
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Re: Yo-yo Discus Sling
Reply #40 - Jun 26th, 2020 at 8:18am
 
It went straight as in like a glande for most of the part that I could see it, but it was quite windy though and I didn't throw exactly with the tailwind, so who knows how the wind might have affected its trajectory. I definitely threw sidearm. I could see it being carried as discs do by the wind when I lost sight of it. I think the groove and the discus spin changes a lot of the aero characteristics compared to a standard golf ball. Anyone else here willing to sacrifice some more golf balls?
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timpa
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Re: Yo-yo Discus Sling
Reply #41 - Jun 26th, 2020 at 7:20pm
 
SmileyI sometimes have to throw it with a short sling,

90s were sold to these  V V (Yo-Bee) (top).
But it didn't fly well.

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Jauke
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Re: Yo-yo Discus Sling
Reply #42 - Jun 27th, 2020 at 2:33am
 
What about the metal ones? How did they fly?
Have you tried the golf ball and or metal ones without flat back and top?
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''He leads the humble in what is right,
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timpa
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Re: Yo-yo Discus Sling
Reply #43 - Jun 27th, 2020 at 6:20pm
 
I have collected a lot of metal discs. But since the 80s, I havenít thrown them. When I then threw them, they flew in a spiral/corkscrew.
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Re: Yo-yo Discus Sling
Reply #44 - Jun 28th, 2020 at 4:11pm
 
Interesting topic and some great posts.  I am always looking for distance ideas, especially golf balls.

Members who are not familiar w/ modern yo-yo's may want to Google "4a yoyo."  This refers to off-string yo-yos.  Not that you would ever want to sling one of these, but there may be some technical ideas that can be used in pursuing this idea.
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