Introduction: Ninja Caltrops

Picture of Ninja Caltrops

So, you wanna be a ninja? Well heres something you might need.

"Caltrops" - A caltrop (calthrop, jack rock, star nail or crow's foot) is a weapon made up of two (or more) sharp nails or spines arranged in such a manner that one of them always points upward from a stable base (for example, a tetrahedron). Caltrops serve to slow down the advance of horses, war elephants, and human troops. It was said to be particularly effective against the soft feet of camels.[1] In more modern times, caltrops are used against wheeled vehicles with pneumatic tires. In Japan such devices were known as makibishi.

Gotta Get them camels!

Step 1: Materials

Picture of Materials

Materials: Scissors and a peice of sheet metal about 1" X 2".
Actually the size doesn't matter but I like this size.

Or if you are using thicker metal use tin snips

Step 2: Cutting 1

Picture of Cutting 1

Here is where the scissors are needed.

Cut 2 lines length wize from each end about 1/3 of the way (see picture)

Step 3: Cutting 2

Picture of Cutting 2


Cut from the... just look at the picture

You want the final out come to look like a squished hour glass

Step 4: Bend

Picture of Bend

Here might be the hard or easy part. If you have thick sheet metal then find something curved and hammer it into shape.

If you got thin metal from a pop can or what have you then you can just bend it with your fingers.

Postition the metal so the hour


Picture of HURT PEOPLE!

Now! Throw it on the ground and it will always land with a point up.

If you made it with thin metal it will probly only hurt people with no shoes but if its thick you'll be ripping TROUGH CAMEL FEET!


TheTerrarianBoss (author)2016-08-08


SAGE27 (author)2012-09-22

it would be fun thinking of diffrent shaps, cat, dog, space invader. I had some more ideas.

TheWrvith (author)2012-02-21

By definition, these work as caltrops, but I'm sure the actual Japanese terminology for them are tetsubishi.

No matter what you call them, toss some of these on the ground while some bare footed Ethiopian children are running after you, and you have a 90% chance of losing them.

You could also build a pit large enough to fall in, and place a bucket full of caltrops at the bottom, and cover the top of your trap with a flimsy wire mesh screen and cover it with leaves.

ninjatesshin (author)2011-11-11

that's not caltrop this is tetsubishi

krackan (author)2008-05-19

FANTASTIC! DIE CAMEL FEET MWAHAHAHA saddly when i fist made these i droped one (unknowingly) on the floor of my living room whilst walking about the room you'll never guess what found its way into my foot....OUCHIE! but all in all fantastic instructable and by the way i made mine very small out of super thrick metals so they hurt through shoes and i cary them in a pvc tube with a cork for being a ninja! THANKS for the instructable!

Kryptonite (author)krackan2009-02-01

Nooo!!! How dare you try get rid of camel feet! Fool! You will never defeat the Kryptonic Camel!!! (Me.)... hehehe, I killed superman, can you kill superman?

I3uckwheat (author)Kryptonite2010-04-28

Well.... I could just call on Chuck Norris!

Kryptonite (author)I3uckwheat2010-05-02

...Do you know how old he is?

I3uckwheat (author)Kryptonite2010-05-02

Yes but it is still Chuck Norris...

Kryptonite (author)I3uckwheat2010-05-03

That's like meeting Bruce Lee, and then meeting a decrepid and old Bruce Lee.

I3uckwheat (author)Kryptonite2010-05-04

What ever i was just trying to make a joke...

Kryptonite (author)I3uckwheat2010-05-05

He he. Joke destroyer :P

I3uckwheat (author)Kryptonite2010-05-05

No kidding...

The nerdling (author)I3uckwheat2011-06-08

i killed chuck norris yesterday i was so bored so i just killed him

Look at my muscles i can kill you too :D

Air_Assassin (author)I3uckwheat2010-12-23

Kill dog feet!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! MWAHAHAHAHAHAHAHHAHAHAHA!!!!!!!!!!!!!

I can! Well no, not really...

Well... Your name is count jamez... Yeah, could kill him.

Oh god my reply has been sitting here for over a year.

bowmaster (author)krackan2008-07-01

What found its way into your foot?

FreshPineSent (author)bowmaster2008-07-05


bowmaster (author)FreshPineSent2008-07-08

I was kidding! I know he stepped on one of them.

Kryptonite (author)bowmaster2010-04-18

Well he would have had to, to try it out.

Kryptonite (author)FreshPineSent2009-02-01

As my good friend would say... EPIC FAIL. lol

ilpug (author)bowmaster2009-10-29

 heh heh, i did.

Kryptonite (author)2010-03-30

Easy deployable car slower downerer. Perfect!

The nerdling (author)Kryptonite2011-06-08

slower downerer lol

shdsteel (author)2010-07-28


PJPEEJ (author)2010-06-09

How did you manage to spell through wrong?

makerboy112 (author)2010-04-27

There is three spikes on a clatrop. (or more) With two it would lay flat.

tsukiyomaru0 (author)2010-04-19

More interesting way:
Cut up pieces of a 2mm wire
All pieces must be 5cm long
"tie" then together
ensure each piece forms a 90º, even while tied to another

*for added effect, ask someone to sharpen it or sharpen it yourself! >:D

skunkbait (author)2008-05-23

The best caltrops for stopping pneumatic tires have hollow spikes (Think HEAVY syringe) that let the air flow out fast. Solid ones can just plug the hole. You can keep a pile of them in your cars trunk with a remote operated deployment hatch (RC or cable operated). Let's see the cops try and catch THIS speeder!!

iBurn (author)skunkbait2008-10-05

....isn't that what James Bond had....? In the same car that had unbreakable windows and the entire car could be electrified so that anyone who touched it would get shocked....? God bless Q.

skunkbait (author)iBurn2008-10-06

I don't know. I learned that trick from my pot-head cousin with too much time on his hands, and an occasional reason to run from the cops.

iBurn (author)skunkbait2008-10-06

LOL The part about the hole, or the part about the RC thing that drops them?

skunkbait (author)iBurn2008-10-06

The hole.

iBurn (author)skunkbait2008-10-06

Oh, well james bond had the automatic dropper thing in his car......

skunkbait (author)iBurn2008-10-07

I think I saw the remote/trunk thing in the "Poor Mans James Bond" or "Anarchist Cookbook".

goeon (author)skunkbait2008-11-29

or just get a remote control dumptruck and duct tape it to youre bumper

skunkbait (author)goeon2008-11-29

That's actually not a bad idea. I mean obviously it would be best to disguise it somehow, but a simple remote operation like that might just work!

goeon (author)skunkbait2008-11-29

or get a mechanisam from a car that you fill the gastank behind the licence plate and have a potatoe cannon so when you fire the licence plate flips down

skunkbait (author)goeon2008-11-29

My son's old Pontiac has the flip down plate. I hope he doesn't see this discussion, 'cause he might try it!

iBurn (author)skunkbait2008-11-29

haha, I want one.

goeon (author)iBurn2009-01-18

want what

iBurn (author)goeon2009-01-18

A car that fires potatoes at pursuer's...

Evidenceremoved (author)iBurn2010-04-15

Pew, Pew potatoes!

goeon (author)iBurn2009-01-18


goeon (author)goeon2009-01-18

Potatoe tank!!!

just hire a guy with a gernade launcher to sit in your trunk, bye bye cops

--Thatguy-- (author)skunkbait2008-07-22

If you curved the tips of these calthrops, think you could acheive the same result?

skunkbait (author)--Thatguy--2008-07-22

Maybe, if the metal is strong enough.

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