| Are cards dangerous in the right hands? |
| yes |
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43% |
[ 7 ] |
| no |
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56% |
[ 9 ] |
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| Total Votes : 16 |
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Message
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| biohazard87 |
 Posted: Thu Feb 16, 2006 7:50 pm Post subject: Card! Are they dangerous weapons in the right hands? |
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Forum Sophomore
Joined: 15 Nov 2005
Posts: 180
Location: With your mom
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So I think that a card if thrown at a high enough speed could potetioally be fatal, but that speed would have to be at least 80mph. It could be a lower speed if it hit a vital point but I think the amount of acuracy needed for that would take years to learn.
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| Lucifer |
| Posted: Fri Feb 17, 2006 2:48 am Post subject: |
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Forum Junior
Joined: 14 Jan 2006
Posts: 241
Location: Close to 290125001
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Houm...
What are you doing?
There at the Physics forum you ask for a mean to throw cards at different speeds. 
Now here you want to know if a card can kill someone? 
Are you plotting a murder or what? 
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| Ophiolite |
| Posted: Fri Feb 17, 2006 3:23 am Post subject: |
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Forum Radioactive Isotope
Joined: 25 Jul 2005
Posts: 4016
Location: Scotland
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| Yes. What's the deal with the cards. If you wanted to kill someone you would be better to hit them with a club, or induce a heart attack. Then you'd have to move in with a spade to dig their grave. When the police came to question you, you would have to maintain a poker face. It might suit you. I have to hand it to you, you're a real diamond in the rough. |
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| Cuete |
| Posted: Fri Feb 17, 2006 8:47 am Post subject: |
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Forum Junior
Joined: 20 Jun 2005
Posts: 246
Location: 4722,28 miles away from home
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Now I'm confused. Is it a physics project or you're secretly building some poker weapon of mass destruction?
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Cuete
http://hiperyo.com/ |
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| biohazard87 |
| Posted: Fri Feb 17, 2006 5:29 pm Post subject: |
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Forum Sophomore
Joined: 15 Nov 2005
Posts: 180
Location: With your mom
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[quote="Lucifer"]Houm...
Are you plotting a murder
No I am not ploting a murder. My project was sparked by an interesting discusion about wheather or not someone could be killed wit ha card. I said that I thiught that they could if the card could travel at a high enough speed. My friend said it was completly imposible, so I decided to do an experiment to see if a card could travel fast enough to go through something. I had to change the general idea, so as not to make my teacher think I was trying to find a way to kill people, and then my teacher told me I would have to change my project again. Seeing as how I figured that I would no linger be able to test to see if I could put a card through some solid object, not living, I decided I would just ask for the opinions of all the smart people here at scienceforum.com. I am not going to actually harm anyone or anything.
Maybe if I can get a card to travel at a high enough speed, then maybe I will see if I can get one to go through, or at least lodge one into, something like a peice of plywood. That is all. No poker weapon of mass destruction. Sorry guys.
Oh, and thank you Ophiolite for al the card jokes
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| silkworm |
| Posted: Fri Feb 17, 2006 5:30 pm Post subject: |
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Forum Senior
Joined: 15 Nov 2005
Posts: 349
Location: Kansas
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| I'm not playing cards with him until I get a bullet proof vest. |
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| Lucifer |
| Posted: Sun Feb 19, 2006 9:12 am Post subject: |
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Forum Junior
Joined: 14 Jan 2006
Posts: 241
Location: Close to 290125001
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Houm...
Well, biohazard I wasn't hinkig fo a rla murder but of a plot (fro a story, or alike) involving a murder with a card.
The point in moving a card fast across air is that it must be "flat" and rotating on itself. Why rotate? Because as soon as it starts traversing the air, will arise aerodinamicla forces; the part cuttign the air will behave as a leading ege and the card will roll over tiself and be perpendicular to the air flow... and will stop quickly. The only way to avoid this is to "shfit" the side of the card performing as a "leading edge", so the aerodiamical forces are neutralysed.. anyway, there still will be a resulting momentum which will raise the card, and any imperfections will create drag which also will tend to flip over the card and brake it.
The real trouble of a card as deadly weapon is that it is too light and haves got a big surface, and so the air affects it a lot.
Anyway, a good point would be to find what is the optimal combination of speed and rpms, the one which allows the card to travel the further. Or try sjut with spee.d To few speed, ti is ahlted before reaching far, too much speed and aerodinamic forces wil flip it over an will be halted too.
But as deadly weapon... it isn't sharp and hard enough to be able to cut.
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| Ophiolite |
| Posted: Sun Feb 19, 2006 9:35 am Post subject: |
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Forum Radioactive Isotope
Joined: 25 Jul 2005
Posts: 4016
Location: Scotland
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| OF course you could used a card sized and shaped object made of say tungsten, or depleted uranium. |
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| biohazard87 |
| Posted: Tue Feb 21, 2006 7:31 am Post subject: |
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Forum Sophomore
Joined: 15 Nov 2005
Posts: 180
Location: With your mom
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But couldn't it still kill someone if it could travel fast enough. Because there are a few people that can throw a card at 90+mph. I was thinking that if you got hit in the right area,say the face, with something moving that fast then it could potentialy kill you, right?
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| Cuete |
| Posted: Tue Feb 21, 2006 8:30 am Post subject: |
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| (In)Sanity |
| Posted: Sun Feb 26, 2006 5:55 pm Post subject: |
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Forum Cosmic Wizard
Joined: 19 Oct 2004
Posts: 2081
Location: Phoenix AZ
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I really think you would be better off using it as a knife then as a projectile. Freeze the card to absolute zero first, then try it.
Ohh wait, better yet accelerate the card to the speed of light and I bet the particles would kill something 
Tornadoes have driven pieces of straw in to telephone poles (or so I've read), those seam pretty harmless by themselves. Fold the card in to a tube shape maybe.
Left unaltered, not sure how much damage it would do much beyond a couple feet.
LOL, I have no clue. |
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| wallaby |
| Posted: Sun Feb 26, 2006 11:04 pm Post subject: |
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Forum Professor
Joined: 03 Jul 2005
Posts: 1375
Location: Australia
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they tested this on mythbusters.
the card launched at a human would barely sufficient energy to penetrate the skin by even a millimeter. |
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| Neutrino |
| Posted: Mon Feb 27, 2006 2:25 am Post subject: |
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Forum Ph.D.
Joined: 02 Nov 2005
Posts: 978
Location: Columbus, OH
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| I saw that one - I can't remember how they launched the card though, or what speed it was going at. |
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| Neutrino |
| Posted: Mon Feb 27, 2006 2:28 am Post subject: |
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Forum Ph.D.
Joined: 02 Nov 2005
Posts: 978
Location: Columbus, OH
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Actually I found it:
Playing cards as weapons (Killer Deck)
Myth: an ordinary playing card can kill you with a powerful throw.
Adam is really good at throwing cards (been doing it since he was 10), so this was a personal mission for him.
Ricky Jay: card throwing "expert," author of Cards as Weapons, a book describing the use of the playing card as a weapon. He can throw cards up to 90mph (Adam can only throw 25mph).
Adam wants to build a machine that can throw a card. He and Jamie face off in their competing designs, and as always, Jamie's simple design (modelled on a baseball pitching machine) wins out. Adam tried to replicate arm mechanics with a spring loaded mechanism and fake fingertips, that he admits was "over elegant." In Jamie's words, "Adam actually had a pretty clever idea. It doesn't work, but it was pretty clever."
Jamie's design was pretty awesome. It flung cards through two spinning wheels at 70mph. I want one. One of the spinning wheels did break apart due to the 30,000 rpm speed. I still want one.
The rebuilt throwing machine (with metal wheel) flung cards at 150mph. I'm not sure if I want the card throwing machine or the penny gun more (the penny gun seems more portable).
They tested on ballistics gel to measure how it might actually penetrate human flesh.
Ballistics gel experiment:
* 1/4" with Adam throwing.
* 1/2" with 150mph card throwing machine
* 7" with pellet gun
* 20" with heavy crossbow bolt
After it was pretty clear that even the super gun wouldn't do much damage, Jamie offered to be the target for once. It drew a little bit of blood, but not much more.
Mythbusted |
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| biohazard87 |
| Posted: Mon Feb 27, 2006 10:30 am Post subject: |
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Forum Sophomore
Joined: 15 Nov 2005
Posts: 180
Location: With your mom
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Yes but another important factor, that I think is fairly inmportant, is the rps of the card. That is the amount of times the card can make a complete revolution per second. The tennis ball gun seems to just shoot the card out flat like this ------------------. Whereas with the spin it moves more like this --/--/--/. I am pretty sure that this spin is necessary for the speed and force necessary to inflict bodily harm as it brings one end down with all the force of the spin.
I also think that the spinning helps with laminar flow, which gives it a better chance of doing damage.
I have also resently been informed that the heavier the card, up to a point, the more dangerous it is. Like CD's, they are very dangerous when thrown the right way. Someone I know threw one not really trying and put a huge gash in the wall, and I did it and broke the glass in one of my picture frames (by accident)
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