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the spudfiles coin challenge

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the spudfiles coin challenge

Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 12:16 pm

Following on from this thread, I thought I'd see if my 6mm burst disc project was up to the challenge. Target was a 10 Euro coin (I hear the dollar is weak against the Euro right now, so it must be tougher than a quarter ;p) and ammunition was a 40mm long masonry nail wrapped in tape to fit the barrel. The video and pics speak for themselves :)

[youtube]http://youtube.com/watch?v=qo3isPLAzVo[/youtube]
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DSCF0998.JPG
success!
DSCF0999.JPG
break on through to the other side - the nail hammered the ply backing to my bed (about 1/4" in) that was behind it :-/
DSCF1000.JPG
I eventually managed to pull the coin out
DSCF1001.JPG
exit hole through the coin
DSCF1003.JPG
the coin is just over 1/16" thick
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Unread postAuthor: spanerman » Thu Sep 13, 2007 12:23 pm

oh i realy want a small bore for the hybrid!!! nice damage btw :)
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Unread postAuthor: paaiyan » Thu Sep 13, 2007 12:37 pm

JSR ftw!

Nicely done. Though you shoudl try it with a smaller diameter metal thing... I mean like a needle or somethign.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 12:40 pm

paaiyan wrote:Though you shoudl try it with a smaller diameter metal thing... I mean like a needle or somethign.


Dude, this is costing me 10 cents a pop! hehe I'll have a rummage around and see if i can find a needle :)
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Unread postAuthor: paaiyan » Thu Sep 13, 2007 12:42 pm

jackssmirkingrevenge wrote:
paaiyan wrote:Though you shoudl try it with a smaller diameter metal thing... I mean like a needle or somethign.


Dude, this is costing me 10 cents a pop! hehe I'll have a rummage around and see if i can find a needle :)


So shoot the same coin. It's got plenty of space left for a needle. Just take that nail out, hammer the coin a bit to get the dent out and shoot it again.
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Unread postAuthor: spud yeti » Thu Sep 13, 2007 12:45 pm

give me a O give me a W give me a N give me E a give me a D
What does that spell? OWNED! :D

Nicely done!

What pressure was this running at?
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really good quote/phrase here
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 12:59 pm

What pressure was this running at?


f***ed if I know, my gauge is screwed, it reads 40 psi when empty - but it was at least 300 psi.

Well, here's the biggest needle I could find, wrapped in masking tape, next to a new coin (it's ok paaiyan, I'm not that poor :D)

It'll probably ricochet and blind me, if not I'll upload the vid :)
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Unread postAuthor: paaiyan » Thu Sep 13, 2007 1:01 pm

Well you should put a couple more cois over your eyes, that way if it ricochets and blinds you, we'll still be able to see if it went throug the coin, lol. Just kidding jack
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 1:30 pm

Ok, I was about ready to call this one busted - after the shot, I found the back half of the needle and saw the gouge in the front of the coin that was slightly embedded into the plywood and figured it had just broken and ricocheted off.

I checked the back of the coin for completeness sake and was amazed to find an exit hole :shock: and some searching later, sure enough I dug the front half of the needle from my bed.

Scary stuff, I truly believed it wouldn't go through. That, ladies and gentlement, is the power of sectional density :D
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DSCF1007.JPG
needle halves and coin front
DSCF1008.JPG
needle halves and coin back
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complete penetration o_0
DSCF1006.JPG
what I though was the only result...
Last edited by jackssmirkingrevenge on Thu Sep 13, 2007 1:34 pm, edited 3 times in total.
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Unread postAuthor: Fnord » Thu Sep 13, 2007 1:30 pm

I accept your challenge, my good sir.

...

Thick needle shot from my hybrid's marble barrel at ~4x.
The needle in the picture is not the same one I shot(it's slightly bigger) for unexpected reasons.

I wrapped electrical tape around the needle and used a piece of 3/4 plywood for a backstop, and was surprised when the needle went completely through the plywood and the tape dented the quarter badly.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 1:33 pm

nice :D I just did the same, see above hehe
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Unread postAuthor: Hubb » Thu Sep 13, 2007 5:10 pm

@jackssmirkingrvenge - Contuning from the other thread, this kind of thing is expected with that little beast you shoot.

@_Fnord - I would assume you used your handheld hybrid, which is also a beast. Again, this is expected.

I am just having a really hard time picturing this happening with a ball valve cannon, then the needle not even bending or the coin being dented.
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Unread postAuthor: dongfang » Thu Sep 13, 2007 6:46 pm

Hi,

Wow, that´s incredible! Unfortunately for me, the Danish coins either are too small (25, 50 øre), have a hole in them already (1, 2, 5 kr), or are worth too much (10, 20 kr) to shoot!

10 euro, I thought what a waste, then I realized it was 10 cents.

Regards
Soren
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Unread postAuthor: Novacastrian » Thu Sep 13, 2007 9:39 pm

I'm just blown away! I called BS on the other thread- don't i feel like a goose now.
Really nice to see :D
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Unread postAuthor: SpudBlaster15 » Thu Sep 13, 2007 10:37 pm

I just shot a quarter using a nail dart fired out of my hybrid launcher. The quarter was attached to a 2x4 using CA glue, and the shot was taken from nearly point blank. However, I did not find the coin after the shot. The 2x4 was split in half. Tomorrow I will repeat the shot, hopefully with better success.
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