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Instant Caltrops

Instant Caltrops
An ancient weapon like a metal sandburr. It's a nail with multiple points that has at least one point upward no matter how it lands. They are also called "star nails". This is the quickest way to make them.

Warning:
Some people consider caltrops a political weapon in this era of wars for oil for vehicle fuel.
If you are such a person you should pursue your ends by peaceful means instead.
Remember Noam Chomsky's advice:
"If you fear the government the proper response is to get more involved in government, rather than less so, because the Government really is the institution that represents you."
Watch the movie "Weather Underground" to find out what some famous political vandals wish they'd done instead.
I think it was Bill Clinton who said, "It's best to conclude that bad policy is caused by ignorance, not malice."

Safety Warnings:
Flying sharp metal will hit you in the eye.
If someone steps on one of these they'll get hurt.

Excellent photos by theinfonaut
 
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Step 1Nicaraguan Caltrop

Nicaraguan Caltrop
Caltrops in the Gallery of Heroes and Martyrs in the town of Masaya, Nicaragua.
These look like barbed wire barbs cut off and welded together, but they're much larger than any barbed wire I've seen. These were used in the revolution against Somoza in the late 70's. Nicaraguans threw them onto roads in front of troop truck convoys to delay them with flat tires.
Somoza was a ( yawn, yet another ) U.S. supported brutal dictator.

By the way, a recent issue of Time magazine reported that Nicaragua now has the lowest risk of terrorism in the hemisphere.
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66 comments
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Mar 29, 2012. 7:51 PMgeneralmesh says:
Hebei general metal netting Co.,ltd mainly produce and export brass wire mesh ,Phosphor Bronze Wire Mesh and red copper wire mesh ,etc for 10 years.
Uses: screening a variety of particles, powder, porcelain clay, glass, porcelain, printing, filtering liquid and gas,Mining, metallurgy, construction, medicine and other industries of the screening.

http://www.generalmesh.com
Feb 23, 2012. 8:55 AMgeneralmesh says:
http://www.weldmeshfence.com
China Manufacture of wire mesh fence,weld mesh fence,fencing wire,fence panel panel fencing- Hengshui werson wire mesh fence Co.,Ltd
Feb 23, 2012. 8:54 AMgeneralmesh says:
http://www.generalmesh.com
The world very famouse filter mesh ,wire cloth ,mesh screen ,shielding mesh ,paper making mesh manufacture and exporter .
Aug 14, 2006. 6:34 AMradiorental says:
"Warning: Some people consider caltrops a political weapon in this era of wars for oil for vehicle fuel. If you are such a person you should pursue your ends by peaceful means instead." It would seem to me that anyone using these for such a purpose would also want to weigh up this 1) Will cause the car owner to go and purchase a new tyre - more consumption. Although I guess the tyre could be easily repaired 2)If more than one tyre is pucntured it would mandate a pickup truck call-out, more gas consumption 3)Very unlikely to change the car owners mind about the use of their car. A more effective method are those stickers "did you know your SUV is causing global warming"
Jan 6, 2012. 9:45 PMLokisgodhi says:
You're assuming that the person will care about your opinion beyond the fact that they are inconvenienced by having to remove the sticker from their vehicle. That's probably unlikely to be the case.

Caltrops are minimally destructive device and will cost significantly longer in money and time to repair or replace the tire. They're non lethal assuming one isn't moving at a high rate of speed when you hit it.

The last, more extreme option would be to devise a catastrophic or lethal device, like a cable strung across a thoroughfare or and IED.



Dec 18, 2007. 4:24 PMsonaps says:
this guy should really learn how to spell the word "tire" in the correct fashion, it isnt hard, just think (referring to radiorental)
Jan 1, 2008. 10:51 AMWeissensteinburg says:
"Tyre" is actually the correct spelling in British English. It's just like "colour".
Sep 21, 2006. 10:13 AMjswilson64 says:
Doesn't the production of bumper stickers cause global warming? ;-) Better to just leave a note. I particularly like: "Santa knows you're causing global warming."
Mar 24, 2008. 11:13 PMLokisgodhi says:
Using a schrader valve core remover and taking the core out of all four of the valve stems is rather effective too.
Nov 3, 2011. 12:12 PMbtackett1 says:
these can also be used as a project for school if your school has you do a project that requires you to research on something from ancient times
Feb 23, 2010. 12:56 PMBenEatsNails says:
 if you can bent it with a set of pliers then a car or even a shoe is gonna bend it.
but this work in bigger scale
Mar 4, 2010. 5:10 PMcooy says:
the caltrops that he describes will not work. however if done on a large scale like you suggest.  I would know this as these caltrops just got me expelled from school by getting back at another student.
Nov 3, 2011. 12:10 PMbtackett1 says:
lol wow u failed
Mar 25, 2011. 6:10 PMweldmeshfence says:
http://www.generalmesh.com
http://www.weldmeshfence.com
Feb 7, 2011. 12:29 PMAXHEJAZ says:
simply awesome! thanks man, i'm going to try to get thicker wires though to make the caltrop stronger!
Apr 23, 2010. 10:00 AMninja patrick says:
wow it is assum
you are briliand
it is so easy and cheap
but is it strong enough?
don't it breack whan a human stand on it?
Apr 19, 2010. 10:12 PMtsukiyomaru0 says:
Ah, I knew I'd see something that thought like me... This might work great if you're running from someone that you believe that may want to harm you in any way. Team it up with CD kunai or Shuriken for MASSIVE DAMAGE!
Dec 15, 2006. 6:21 PMJesus10555 says:
lol, if they are only for pocketing at the renaissance festival, why do you have pictures of them situated under a tire, lmao
Dec 7, 2008. 9:45 AMmazeka.14 says:
what does imao mean?
Jan 18, 2009. 5:08 PMgoeon says:
laugh my @$$ off
Oct 31, 2009. 2:08 PMseabee890 says:
??? What does @$$ mean ??
Dec 29, 2009. 6:44 PMteslafan100 says:

@$$ means butt. lol
Oct 31, 2009. 2:08 PMseabee890 says:
just kidding
Aug 4, 2009. 1:01 AMloppy96 says:
thanx
Jan 19, 2009. 2:41 PMmazeka.14 says:
awesome!!!!!!!!!!!!
Oct 31, 2009. 2:12 PMseabee890 says:
we had a few animal lovers  = at my high school that were so upset about the rednecks running over animals with 4x4's that whenever they would find road kill they would boobytrap the carcasses with roofing nails so the next one to run over it would get a karma tax.  the nail were big enough that and carcass eating animales in the are a would not eat them, and dull enough not to hurt live animals. they just treated them like bones. 
Oct 27, 2009. 12:47 PMColonel88 says:
Put these in your pocket so when someone tries to pickpoket them they go OWCH.
Apr 26, 2009. 9:50 AMrofus says:
these are so simple to make. i cant believe i didnt think of this bafore. ty
Dec 8, 2008. 7:04 AMgoogbar says:
I guess you could make a potato cannon and fill this stuff to be shot from behind your car... ;-) . BTW, I think those fence staples welded would do more damage,
Oct 30, 2008. 5:08 PMshadow12952 says:
good idea
Oct 17, 2008. 6:50 PMThelonelysandwitch says:
these arent near strong enough to pop a tire, these can berely pop a bike tire, use very strong nails welded or twisted together.
Oct 29, 2007. 1:31 AMLokisgodhi says:
That's NOT chicken wire. Chicken Wire is braided wire in hexagons.

The material shown is Galvanized Fencing Mesh.

http://www.mesh-fence.com/wire-mesh/welded-wire-mesh.htm
Sep 16, 2008. 8:57 AMNFI says:
Huge "bump", but you're right - that's not chicken wire. I don't know what these people are talking about.
Mar 14, 2008. 9:06 AMjeffconnelly says:
I'm sure you know what you're talking about, but I'd say that most people would call it chicken wire.
May 15, 2008. 1:32 PMtigerboy says:
exacty
Mar 23, 2008. 1:07 AMsmokehill says:
At the risk of sounding like a smart-ass, I feel compelled to mention that no one who had ever kept chickens or knew anything about them would call that chicken wire, since it obviously wouldn't work to keep chickens in. Most people who buy or use it call it galvanized fencing, "welded wire," or "hog wire" -- though real hogwire is wrapped, not welded. Most 2x4 wire is used for staking tomato or bean plants, or for keeping idle chompers out of your garden. Baby chicks, or even small banty chickens, would walk right thru this 2x4-inch mesh. As Lokisgodhi points out, you need to ask for the right thing in order to get what you want. The wrapping on these should be done tightly, since more than likely the cheap spotwelds on 2x4 welded wire will probably break somewhere during this process. Homemade caltrops are often made by epoxying four shingle nails together at their heads, as some vets may recall. The OSS made caltrops for use by resistance forces, and issued instructions for making your own from wire or nails as a field expedient to disrupt Nazi transportation.
Jan 6, 2012. 8:31 AMJonFG says:
I have been dealing with wire mesh for a long time.. If you really want to see the variations on wire mesh fencing, inclucing chicken wire and welded wire, galvanized and all the size and mesh variations.. you can check http://www.academyfence.com/welded-wire-mesh-fence or http://www.weldedwirefence.com

Mar 14, 2008. 10:51 AMLokisgodhi says:
If you're ordering chicken wire with the expectation of making these, then you're going to be disappointed with what arrives.
Mar 14, 2008. 9:20 AMNotbob says:
I would have to agree jeffconnelly, I would have called that chicken wire too.
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Author:TimAnderson
Tim Anderson is the author of the "Heirloom Technology" column in Make Magazine. He is co-founder of www.zcorp.com, manufacturers of "3D Printer" output devices. His detailed drawings of traditional ...
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