Introduction: Knex War Bomb

Picture of Knex War Bomb
This is my Knex war bomb/explosive/grenade. As the name suggests, this is made For knex wars. It does not blow up in your face while you are making it, explodes violently and sends a lot of knex flying in many directions. Be sure to check out the video below to see it in action. I also added a video of me shooting it with a gun. Enjoy!

Step 1: Collect Pieces

Picture of Collect Pieces

The piece count for one bomb is:
8 Rubber bands. I used ones that were slightly smaller and thinner than #64 elastics, the standard thick ones.

Step 2: Build the Bomb

Picture of Build the Bomb

1: Make these,
2: Put them together like so.
3: Reapeat steps 1 and 2 to get this,
4: Put one on the whites like so,
5: and put the rest on like so.

Watch the video to look at my fast-paced way of putting together the grenades.

Step 3: Chuck It!

Picture of Chuck It!

Your done! Thanks for seeing my instructable. And if you made it this far, you probably made the grenade too. So Thanks, and dont blow up your freinds too much.



The Knex Inventor made it! (author)2016-06-04

This is for sure the best K'NEX grenade/bomb that I have ever seen/made! Thanks for posting it!

oblina (author)2012-04-05

great bomb, I have enough knex, but i am using them for other projects

I_am_Canadian (author)oblina2012-04-05

Well thanks and good luck when you do try it!

guyknex (author)I_am_Canadian2014-09-14

where to get the rubber bands!?

oblina (author)guyknex2014-09-15

You can generally find rubberbands at your friendly office store or sometimes even the office section of a grocery store! (So THAT'S why they exist... hmm... XD)

oblina (author)I_am_Canadian2012-04-07

It was great, but it hurt when i sat on it. Then i took an arrow to the knee

I_am_Canadian (author)oblina2012-04-08

Yeah, dont sit on it.

oblina (author)I_am_Canadian2012-04-09

yeah... my sister knocked it off our coffee table where I set it and it went off then she screamed at me. ;)

bighead5454 (author)2011-12-13

Note to all builders of this epic device: do NOT put a rod down the center, secure it, then fire it from a gun using a rod to propel the ammo. The force makes it explode in the barrel.

Personal Experience.


Yeah. Had a little modded rifle (converted to pistol) that I secured about ten to fifteen bands of varying shape/sizes to. After a few hours, and a few broken grey rods later, I got it to work with all the bands attached. Of course, I wasn't thinking that all the pieces of this 'nade are in delicate balance, so I shoved the rod in the barrel and pulled the trigger.

Not a pleasant experience, and I'll just leave it at that.

Lord of Jaffa Cakes (author)2013-01-31


Fred the evil puppet (author)2012-09-12

i added a wire to it, and made a trip mine. I used it in a war that me and a friend had: i had a ton of traps, including the sipriani rifle v.3
:D i think he still remembers.

Sounds awesome :-D

knex1111111111 (author)2012-08-20

This is the mega knex war bomb.

That's pretty dang legit :-D

mr. 707 (author)2012-07-04

i cant even build this thing without it going off before i finish building.

I_am_Canadian (author)mr. 7072012-07-14

Practice :-)

james4 (author)2011-06-01

theyre called 32 size rubber bands

GASSYPOOTS (author)james42012-01-06

na theyre size 31

I_am_Canadian (author)james42011-08-08

They were larger that 32's but smaller than 64's... They were non-standard if I remember correctly.

james4 (author)I_am_Canadian2011-09-13

33 maybe? or maybe your right and they were nin standard

I_am_Canadian (author)james42011-09-15

I really have no idea what they were to be honest.

Rainbow colored, too.

james4 (author)I_am_Canadian2011-09-17

ok then

jmiester (author)2011-09-04

hah thats one of the ways I put those together :)
It's very good, it mostly shoots shrapnel from out the top and bottom (left and right if hitting the floor), very directional. It's epic :)

I_am_Canadian (author)jmiester2011-09-05

Cheers :-)

jmoore11 (author)2011-08-31

I combined it with ikedog1995 landmine and it shot it up to chest height and then exploded. :D

Danielzxzx1 (author)2010-03-07

How do you build this? Everytime I try to build a segment, the thing explodes. I try to put a finished one down but it explodes. I tried 20 times already and failed at all of them.

jvolbeda (author)Danielzxzx12011-08-14

ik vind het ook maar moeilijk

VINNIE SIFT (author)2011-08-09

that took of some of my skin the blue rod

starwarsjedi76 (author)2011-07-26

i made it but wen i was trying to rebiuld it it almost hit my mother in the face

You have to watch out for that :-)

skyfaller (author)2011-07-28

Just the thing to shoot with my brand new striker pistol! :D

Instantly , that reminds me of FPSRussia shooting explosives, heard of him?

I_am_Canadian (author)skyfaller2011-08-08

Cheers :-)

And I've never head of FPSwhatever it is.

aiverson1 (author)2011-08-05

┌∩┐have a nice day plz
oh and nice grenade i had a big mess to clean up but nice

I_am_Canadian (author)aiverson12011-08-08



tdela cruz (author)2011-04-27


jimmyjimjam (author)2010-10-04

it is so hard to make

mberg (author)jimmyjimjam2010-11-13

It actually isn't if you have the right rubberbands. It takes time to make but it isn't very hard. (my pics)

Practice makes perfect :-)

KnexFreek (author)2010-03-22

 I Found a typo! on step 3 look at how you spelled friends.. lol

I_am_Canadian (author)KnexFreek2010-03-23

Oh hush.


KnexFreek (author)I_am_Canadian2010-04-25

 I will not be hushed!

shieldsam (author)KnexFreek2010-10-31


pie25x (author)KnexFreek2010-06-10

And I will not be exploded with this bomb!

knexlegowizard101 (author)2010-08-05

i made with out the instricions it was easy and awosome

i cant help you sorry

nebih (author)zxzxxzxxzxxzx2010-10-27

he wasn't asking for help u know

GTRPLR1995 (author)2010-10-06

LOL, OK, Ima bring a knex gun next time I come over to, But u wont like it. XD

GTRPLR1995 (author)2010-10-06

0.0 Im never comin over again. XD

About This Instructable




Bio: K'nex is my thing!
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