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the spudfiles coin challenge

A place to ask general spud cannon related questions.
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Unread postAuthor: frankrede » Thu Sep 13, 2007 10:48 pm

Try shooting piano wire through it?
maybe.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 11:11 pm

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.


A long thin object produces a huge amount of force over a small surface area, this is why for example arrows penetrate so deeply for relatively low velocity impacts. Unfortunately I don't have the facilities to "replicate the myth" so to speak, but at least, I gave you the result :D and that was with a pretty thin, weak needle, I would assume a blowgun dart has similar properties.

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


Yes, I roll my cigarettes from 50 euro notes :D hehe not *that* dedicated to spudgun science y'know.

Try shooting piano wire through it?


I could but it would be equivalent to a needle.
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Unread postAuthor: MrCrowley » Thu Sep 13, 2007 11:17 pm

I'll do some proper test tomorrow, but I shot a saboted(sp?) .303 round from my home made paintball gun(DSGR) and it managed to penetrate 3/4 of it which isn't bad for 100psi. I'm gonna try shoot something through besides a needle or a nail.
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 13, 2007 11:32 pm

I called BS on the other thread- don't i feel like a goose now.


This was with a high pressure burst disk pneumatic, but with the launcher in the original video it might well be BS.
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Unread postAuthor: Novacastrian » Fri Sep 14, 2007 12:46 am

I have managed to penetrate two coins with my 12.7mm mini combustion.
A one dollar and ten cent coin. However because the mini is just that i had to use a sharpened 2.5mm diameter "noga" bit. They are made from super tough tool steel.
The ammo didn't go right through but it did produce an entry and "exit" hole, and got stuck in the coin.
Still, pretty cool considering the gun i used- I will try this with my Hybrid after it's reconstructed :twisted:
I reckon someone should try a toothpick!! :roll:
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Unread postAuthor: MrCrowley » Fri Sep 14, 2007 1:34 am

I finally got through mine as well, with my DSGR paintball gun, I wadded a drawing pin in some cotton, I lost the rest of the drawing pin but the pin remains in the coin, I tried to take some pics but its dark here and when I try and take pics too much flash reflects of the coin and same when I tried to take a Pic inside without flash.
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Unread postAuthor: jackssmirkingrevenge » Fri Sep 14, 2007 1:42 am

If we keep going on like this, perforating currency, the global market is going to be affected :shock:

I reckon someone should try a toothpick!!


it is possible, after all you can cut steel with water if it's going fast enough, but I don't think anyone here has the resources to fling a toothpick that fast :D
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Unread postAuthor: chaos » Fri Sep 14, 2007 2:06 am

_Fnord wrote:
Thick needle shot from my hybrid's marble barrel at ~4x....



i might have to try this... does any1 think that a piece of sharpened 1.6mm stainless tig wire has a chance?
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Unread postAuthor: Novacastrian » Fri Sep 14, 2007 2:38 am

Of course it has, sharpen one end and you have as a good bloke once told me " a lot of force due to sectional density" :D
You will kill it Chaos my friend.

Edit: The publican at my local could not care less about "holy" coins.nGood for me as i like a tipple :wink:
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Unread postAuthor: joannaardway » Fri Sep 14, 2007 4:41 am

Damn, I wasn't sure about the other topic, but now, with this evidence in front of me, I'm impressed.
If I had time on my hands, I'd try going through a 2p coin, but time is not friendly at the moment with everything coming up.

Now someone just needs to add these results to the overall Mythspudding answers:
Can you shoot through a coin? Apparently, yes. Myth confirmed.
Did the original source get through with his BV cannon? Unknown. Myth plausible, based on the fact that the sabot in a higher bore could have supplied enough energy to do it.
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Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
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Unread postAuthor: CannonCreator » Sun Sep 16, 2007 11:04 am

wow I geuss that one vid I found on youtube wasn't BS
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Unread postAuthor: Hotwired » Sun Sep 16, 2007 11:32 am

Hum...

The oversized pin I used must have been weaker than I thought. I'll try using a darning needle and hardened steel nail.
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Unread postAuthor: c19o » Sun Sep 16, 2007 11:51 am

I shot this book last night with my mini combustion and a 4ft long .5" blowgun. I was surprised by the power.
Image
The book is like 1/8" smaller than 1".

Now i gotta make a pistol with onboard butane.

:P
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 16, 2007 12:28 pm

c19o wrote:The book is like 1/8" smaller than 1"


So like, 7/8", like :D
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Unread postAuthor: c19o » Sun Sep 16, 2007 12:47 pm

yea, i would make a sabot and shoot a nail nart at a quarter with my golfball gun but i forgot to put in the bumper. and something horrible happened at 125psi lol.
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