So not while shooting an airgun then ?

What sling do you throw them with ?

Lol absolutely.  Someone needs to crack the whole disc sling idea once and for all and it seems you are on the way to doing that. How cool would it be to have disc ammo? Especially if it created lift. My goodness could you imagine how far they would fly.

lol, created lift ?
You are just cruel !

So, hmm, vanes in the centre of the torus maybe ?

Should be simple enough to design the mould -  I wonder how well the clay would hold up ?

Okay challenge accepted

BRB.....

And halfway through the print i realised the solid design flaw.

The central clumn was supposed to be clay to support the fins.
And it's totally the opposite...
Printer off.
back to openscad.

And here we go again !

(meanwhile on the other side of the desk - vetryans crystal edition 60x35 mould is halfway through it;s 8.5 hour build process)

Here's a -really- rough mini video of the right handed mould being made.
The stringy bits between the pegs are down to this filament, which is pretty horrible to print with and partly down to my changing a setting I should have left alone.
But as it takes a couple minutes to clean up,bi couldn't be arsed to change it back 

Cool stuff, CA. I wanna see it in action!

Also, I want to see you make x-zylo ammo, I bet that would fly very far, and work from a normal sling.

Well that was fairly easy

I threw it the length of my workshop with the 'sling' launcher.
I can probably throw it a lot better by hand lol

For any kind of distance you want a much smaller one with a weighted front.

So what you want is a sheet of lead foil.
Cut a strip as long as the paper you're folding to make the leading edge.
Fold it to get some extra density, and fold it inside the paper.

If you use thin card and use A6 size rectangle, you should end up with something possibly small enough to be thrown from a soft leather pouch.

With my bigger one  (made from A5 paper) I just glued a piece of plastic drinking straw alone the tail, where you put your finger for throwing.
The sling is just a length of 2mm masons line with a sliding finger loop.

If I knew what this thing was called - I've probably been making them for over 40 years - I could find a howto.
But I have absolutely no clue what they are called. Hell I don't even have a name for them.
Just 'round paper throwing things that aren't planes'

So there you are

If you wanted a more zylo shaped one. You just make two the same size, and glue one inside the other so that you have 4 tail fins instead of just the 2.
This would also give you a much heavier front end as well.

With two fins, and throwing by hand - as shown in the gif - you lay your index finger along the tail, and depending how you throw, it will go straight, do a loop or just curve round and come back to you.

With 4 tail fin, it would probably fly a lot straighter.
Never tried it

Hmm is at an aerofoil ?

Well yes it is !
https://www.jpl.nasa.gov/edu/teach/activity/ring-wing-glider/
If the best name NASA can come up with is: 'ring wing glider'.
I don't feel so bad about: 'flying ring thing that isn't a plane'

So there ya go