Introduction: K'nex Landmine/ Grenade

This is my knex land mine that shoots out shrapnel when a trip wire is pulled. i decided to use the simple block trigger idea and make something creative instead of a gun (although you may consider this a gun, because it shoots knex pieces) any ways, you can use pretty much any knex grenade that fits itself together loosely, like mine(you just have to put a white rod on it).

Step 1: Firing Mech

This is the Firing mechanism that makes the grenade explode. since the bullet doesnt go all the way in the barrel, it smacks it and makes the grenade blow up. Make sure to tape the firing pin. adjust the rubber bands so that if you pull it back, put it at a 45 degree angle, load in a white rod, and shoot it, it should go 15 to 20 feet. here i used 3 thin rubber bands.

Step 2: Stand

this is the stand that holds everything up. make sure to put something small but semi-heavy on the leg opposite of the trip wire. (in my case, a rock band drum pedal.)

Step 3: Grenade

this is easy, just build it. you can use any knex grenade that fits together loosely like this just ad a white rod

Step 4: Tie to a Doorstop or Some Nail Sticking Out of a Wall or Something

I suggest tying it to a door stop with string and when someone opens the door it goes off. its less noticeable if you put it there and gets you by surprise.
to load it, pull it down the firing pin and load in the grenade. when the trip wire is pulled, it goes off and scatters shrapnel everywhere.

Comments

author
jmoore11 made it! (author)2011-08-31

This worked great for the grenade I used, it exploded at chest height and actually hurt a bit. The only thing is that the trigger where the string is attached should be lengthened to get more leverage. And on ceramic I needed a weight to stop to door from pulling it away. Great booby trap.

author
NGPhil22 made it! (author)2011-03-27

I have a better grenade for this. Instead of spreading over the floor, the fragmentation shoots up and around. I will see if I can get a picture. I have also modded a little bit to it to make it more stable. I also made it so that when you tug on the wire, a pin removes itself so the wire doesn't trip anyone. Thank you so much for the basic design. Very good for pranks

author
Ikedog1995 made it! (author)Ikedog19952011-03-30

Very cool. Yeah this design is VERY basic, so improvements are definitely needed. Thanks for building

author
danbaha made it! (author)2010-08-04

This is the so cool!

author
coleslaw3 made it! (author)2009-04-11

Can i Sharpen Or will It Mess IT up

author
master of knex made it! (author)master of knex2010-07-30

yah good idea

author
Dante9030 made it! (author)2009-07-07

you have rockband!

author
ol987986 made it! (author)ol9879862009-08-13

neeeeeveeerrrr...

author
Dante9030 made it! (author)Dante90302009-08-13

allllllllwwwwwwaaaaayyyyyyssssss!

author
ol987986 made it! (author)ol9879862009-09-12

lol! i have gh world tour i used that instead.

author
ol987986 made it! (author)ol9879862009-09-12

that dont break it proves (kind of) that gh is betta than rockband cos rockband is a cheap, crappy immitation. thanks for listening.

author
mberg made it! (author)mberg2010-06-23

rockband sucks. medium feels like expert. the thing is completly stupid. i use my rockband drums on Guitar Hero 5

author
ol987986 made it! (author)ol9879862010-06-30

gd on u

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Ikedog1995 made it! (author)Ikedog19952009-07-08

mhm, now the pedal is broken in 2 places i have it held together with a ruler and tape

author
Dante9030 made it! (author)Dante90302009-07-08

lol mine is broke right in the middle

author
ooglie_booglie made it! (author)2009-08-29

5*s

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knexman45 made it! (author)2009-06-21

awesome! 5 starz :-)

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Ikedog1995 made it! (author)Ikedog19952009-06-21

thankz

author
barrett50cal made it! (author)2009-05-29

u can also just put a white rod in and lay it down on the ground and aim it at the door...

author
lilnorm123 made it! (author)2009-05-27

if you stick the point of a red connector in the shaft it will fire the way it is pointed!!!

author
knexguner929 made it! (author)2009-05-23

i did it on my sister

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knexguner929 made it! (author)2009-05-23

I used invisible fishing wire BTY 5 *****

author
An Villain made it! (author)2009-04-30

i have an interchangeable head for this that fires spacers EVERYWHERE and my mom wonders how there are little blue rings in her lampshades

author
the_builder made it! (author)2009-03-08

Wow! This thing is awesome! I put one in the doorway to a bathroom in my house, and it scared the crap out of my dad. 5 stars!

author
An Villain made it! (author)An Villain2009-04-16

i built two and set them both up in the bathroom and whenever someone would go in i would just wait for them to come out then reset it.

author
Ikedog1995 made it! (author)Ikedog19952009-03-09

awesome! meh loves teh five stars! lol

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b00mstix made it! (author)2009-03-26

omg this is the best thing ever even my mom was inpressed nice work!

author
knex obsessed made it! (author)2009-02-23

can someone tell me a way i can keep it held down as i don't have rockband or guitar hero BTW cool landmine

author
b00mstix made it! (author)b00mstix2009-03-26

use a tuque as a base skirt or maybe use tape :) hope this helps

author
Ikedog1995 made it! (author)Ikedog19952009-02-24

You don't need to use a Rockband pedal, I just used it because it was close to me and it worked. If I didn't have one, I would use maybe a book opened up a little and put on the ground to make a triangle and stick the cover (hardback) into a prong on one of the yellow connectors. or maybe I would use a weight.

author
knex obsessed made it! (author)knex obsessed2009-02-25

ok thanks for that and btw i am thinking of making 2 of these on at either side and with string then bam also mine goes well high lol

author
Ikedog1995 made it! (author)Ikedog19952009-02-25

thats a great idea. i was just looking around instructables and i never saw a mine with a tripwire on it so i just posted it. mod it all you want and post it even if its good enough. i wont care it only took me like five minutes to make anyways haha

author
knex obsessed made it! (author)knex obsessed2009-02-26

hey can you check out my grenade pleaz and comment thanks

author
bannana inventor made it! (author)2008-07-30

Very cool idea!!!

ROCKBAND RULES!!!=

:D

author
Pbyrd made it! (author)Pbyrd2009-02-17

No, actually Rockband 2 rules.

author
bobbyk881 made it! (author)bobbyk8812009-02-02

*cough* not really *cough*

cool idea though.

author
builder968 made it! (author)builder9682009-01-18

I KNOW!!!!

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pikathebudgie1234 made it! (author)2008-08-25

cool1i made it for myself and what does it look like on the front side of the door???

author
Ikedog1995 made it! (author)Ikedog19952008-08-25

it looks the same its pretty much symetrical on both sides except for the block trigger

author
Undermig made it! (author)2008-08-24

im trying to get my sister but it aint possible... i got a good plan that actualy works. #1 take off the 2 red rods infront to hold for yelow ones.#2 take of the 2 red rods at the back to suport for 2 greys. #3 tie the string to the door so when it opends POW it explode Mwuhahaha o ps dont furget ure rock band waight ath the back so it cant failed!!!

author
Undermig made it! (author)2008-08-23

thats like your best instructables... LOL ns

author
Undermig made it! (author)Undermig2008-08-23

5 STARS

author
necropolian made it! (author)2008-08-01

if any person would replace the video with a black square, no one would notice.

author
bounty1012 made it! (author)bounty10122008-08-06

thats ok ill make a video for it

author
SeMi_AuToMaTic made it! (author)2008-07-30

cool 4 stars

author
Ikedog1995 made it! (author)Ikedog19952008-07-30

thanks

author
I_am_Canadian made it! (author)2008-07-30

"A cup to hold shapnel or goodies or whatever" LOL

About This Instructable

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Bio: I like video games a lot. Mostly guitar hero and rock band. I love the computer too. I like to go outside though. I'm ... More »
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