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Yo-yo Discus Sling (Read 4616 times)
AncientCraftwork
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Re: Yo-yo Discus Sling
Reply #15 - Jun 24th, 2020 at 5:04am
 
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« Last Edit: Aug 15th, 2020 at 5:29am by AncientCraftwork »  

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Curious Aardvark
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Re: Yo-yo Discus Sling
Reply #16 - Jun 24th, 2020 at 8:23am
 
AncientCraftwork wrote on Jun 24th, 2020 at 3:25am:
I just threw 5 clay disks into the distance
My jaw dropped, they flew unlike anything I have thrown. I am more convinced that this is a possibly world distance record breaking sling design.

Give this a shot guys, buy some clay, make some disks, anyone can do this, this is super fun.

of course sidearm is the way to go here.



Simple enough to make a consistent mould for  yo-yo sling ammo.
Though I do love the stick rolling idea. 

I've got a clear day today - let's see what we can do Smiley

(20 seconds later)
Hmm, actually harder than thought - hinged mould isn't going to do it, which is a shame - or will it ?
Sliding roller is much easier, though the flattish shape could be an issue.

Okay I'll have soime lunch and fire up openscad this afternoon Smiley
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Re: Yo-yo Discus Sling
Reply #17 - Jun 24th, 2020 at 8:25am
 
I would love to see some video of these in action and what they can do to a target Cheesy
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AncientCraftwork
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Re: Yo-yo Discus Sling
Reply #18 - Jun 24th, 2020 at 8:48am
 
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« Last Edit: Aug 15th, 2020 at 5:30am by AncientCraftwork »  

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Re: Yo-yo Discus Sling
Reply #19 - Jun 24th, 2020 at 10:51am
 
I can see that working very well.great job
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Re: Yo-yo Discus Sling
Reply #20 - Jun 24th, 2020 at 12:14pm
 
in case anyone wants to play around with a 3d model.
copy and paste everything in the 'Quote' box, into openscad and hit f5 to update after you've changed any of the variables Smiley

'f5' gives you a quick render - 'f6' gives you a useable model you can export to a full 3d format. stl for 3d printing, and various others.
'f6' takes longer - sometimes, a lot longer Smiley

Use your mouse in the display window to move things around. Mouse PLUS left button rotates, mouse plus Right button moves. scroll wheel zooms in and out (unless you have a mac, 'cos apple don't trust mac users with scroll wheels) 

All numbers/measurements are in millimetres.

Quote:
// yoyo generator
$fn=50;

module yoyo(){
wd=10; // width disc
hd=60; // height disc
st=20; // spindle thickness
sg=4; // spindle gap
dt=10; // disc thickness


translate([0,(dt+sg)/2,0]) resize([hd,dt,hd]) sphere(d=10);
translate([0,-(dt+sg)/2,0]) resize([hd,dt,hd]) sphere(d=10);

translate([0,sg,0]) rotate([90,0,0]) cylinder(d=st,h=sg*2);
} // end mod

yoyo();


Openscad download link below. Works with windows, mac & linux
https://www.openscad.org/downloads.html

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yoyo.PNG (65 KB | 12 )
yoyo.PNG

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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IronGoober
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Re: Yo-yo Discus Sling
Reply #21 - Jun 24th, 2020 at 12:51pm
 
I wonder if a disc with two nubs for holding 2 strings (one top, one bottom) would work better than a single nub in the middle. I guess I'll also have to try printing some prototypes.

Great idea Jauke! I've always tried to think of a way to skip stones with a sling...I didn't realize the solution could be so simple.
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John R.
 
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Re: Yo-yo Discus Sling
Reply #22 - Jun 24th, 2020 at 12:52pm
 
here's a version you can actually print:

Quote:
// yoyo generator
$fn=50;

wd=10; // width disc
hd=60; // height disc
st=20; // spindle thickness
sg=3; // spindle gap
dt=10; // disc thickness

module yoyo(){



translate([0,(dt+sg)/2,0]) resize([hd,dt,hd]) sphere(d=10);
translate([0,-(dt+sg)/2,0]) resize([hd,dt,hd]) sphere(d=10);

translate([0,sg,0]) rotate([90,0,0]) cylinder(d=st,h=sg*2);
} // end mod

module printable(){
difference (){
yoyo();
translate([0,0,hd/2]) cube([hd+10,hd+10,10],center=true);
translate([0,0,-hd/2]) cube([hd+10,hd+10,10],center=true);
} // end diff


} // end mod

//yoyo();
printable();


Looks like a tie fighter Smiley
Won't need supports, it's just got to bridge 3mm gap (in the script above anyway).
Just started one Smiley

I could make the cutoff's a l;ot smaller - but this way there won't be any issues printing one.

The nubs either side would not work as well.
they would increase air resistance for one and you would lose all the rotation you gain from it running along the cord.

On the other hand it would throw from a standard split pouch sling.
But the nubs would probably also stop it skipping.

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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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AncientCraftwork
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Re: Yo-yo Discus Sling
Reply #23 - Jun 24th, 2020 at 1:21pm
 
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« Last Edit: Aug 15th, 2020 at 5:30am by AncientCraftwork »  

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AncientCraftwork
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Re: Yo-yo Discus Sling
Reply #24 - Jun 24th, 2020 at 1:38pm
 
Nice work CA, you're the mold master
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Re: Yo-yo Discus Sling
Reply #25 - Jun 24th, 2020 at 3:31pm
 
we'll see Smiley
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Re: Yo-yo Discus Sling
Reply #26 - Jun 24th, 2020 at 5:02pm
 
I turned this in 2012. But I didnít dare throw it. I would have lost it.
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Re: Yo-yo Discus Sling
Reply #27 - Jun 24th, 2020 at 5:05pm
 
Curious Aardvark wrote on Jun 24th, 2020 at 3:31pm:
we'll see Smiley


Not at all surprised that you designed that... I am a little surprised by how fast you made it though.
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Re: Yo-yo Discus Sling
Reply #28 - Jun 24th, 2020 at 5:08pm
 
AncientCraftwork 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.
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Lewis.
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IronGoober
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Re: Yo-yo Discus Sling
Reply #29 - Jun 24th, 2020 at 6:42pm
 
timpa wrote on Jun 24th, 2020 at 5:02pm:
I turned this in 2012. But I didnít dare throw it. I would have lost it.


Timpa,
You have a duty to this forum to make a video of you throwing this...
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John R.
 
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