Introduction: Knex Tyre Cannon

Picture of Knex Tyre Cannon

It started off as a way to store all of my extra green rods but then i though it could be used as a giant barrel so i made this!!!! it is quite powerful however it is easily damaged if dropped or gripped too hard!!

Step 1: Pieces

Picture of Pieces

You need:

8 large wheel tyres
2 large wheels
3 elastic bands (UNLIKE IN THE PICTURE)
112 green rods (not including ammo)
2 tan connectors
1 small wheel and tyre
1 grey rod
1 white connector

Step 2: The Barrel

Picture of The Barrel

This it the bit that takes for ages to do!!! Take the 2 wheels and put 2 of the tyres on them then pic up some of the green rods and press them into the tyre treds as hard as you can, as in the picture. then repeat this with the rest of the tyres.

Step 3: Firing Rod

Picture of Firing Rod

For this you need the small wheel, the grey rod, 2 tan clips and a white connector.
clip the tan clip on the end of the grey rod so that the small rod on the clip is pointing towards the rest of the rod. then slip the wheel on so the tan clip is connected to the wheel. then attach the other tan clip to the rod but on the opposite side to the other clip and so it faces the wheel and connect it to the wheel. then push the rod through the wholes on the large wheels in the barrel and then clip onthe white connector to the end. as below

Step 4: Attaching the Bands

Picture of Attaching the Bands

Put 2 large elasic bands in the top clip of the white connector (i forgot to put 1 on it the pic) and then hook these bands on to the treads of the tyres and then put a other band around them to secure them.

Step 5: Loading and Firing

to load the RPG just pull back the ram, grab a had full of rods and drop them in the barrel then release the ram and the rods will fly out the end prity fast!!! (depending on bands) creating a peppering effect like a shotgun!! also if you want you could put BB pellets in!!

If you are having problems with the ram hitting the sides of the barrel then just check the tyres are aligned and if that still doesnt work then remove the tyre on the ram.



knexboy586 (author)2013-01-19

Asome 5*

iloveemogirls (author)2010-06-08

its a awesome grenade

snerblemeister (author)2010-05-26

i reinforced the inside of mine with duct tape!

Furloy (author)2010-01-09

 nice idea but after one shot it turnes into bullshit because youll brake it re-loading, just throw it

ravens claw (author)2009-12-14

your gun sucks ha ha you got owned

Did I?...Really?

DrWeird117 (author)2008-07-03

this gun, or any of Loosewire; SOE Operative's stuff=OWNAGE!!!!!!!!!!!!

worth the 5.154396 seconds it took to build.

airsoft BBs- pour entire container in-release=BOOM!!!!!!!!!!!!!!!!!!!!

only true shotgun on this site! +10000000000000

KnexFreek (author)DrWeird1172009-11-21

 mine is a true shotgun kinda

apples!!!!! (author)DrWeird1172008-09-19

Not the only shot gun, and that still wouldn't be a real shotgun, for there is no pump, stock, trigger, handle, and much of a body.........

DrWeird117 (author)apples!!!!!2008-09-20

A shotgun doesn't need any of those except the trigger.

apples!!!!! (author)DrWeird1172008-09-21

Either a pump or shells loaded through the back. And it does need a me a shotgun that is considered a shotgun that has no handle or pump/shells.....

DrWeird117 (author)apples!!!!!2008-09-21

Well...I guess it needs a handle. And shells, you need those. There are some single shot shotguns. And the standard double barrel coach gun, it has no handle per se, and has no pump. l guess you're right.

chopstx (author)DrWeird1172009-07-08

they dont need handles. have you seen the older, wooden and metal ones? you hold a part of the gun. although it could be considered a handle...

DrWeird117 (author)chopstx2009-07-08

I know, like a standard double barrel coach gun?

chopstx (author)DrWeird1172009-07-09


TigerNod (author)DrWeird1172008-10-16

In my opinion, it is the only shotgun yes... But not for long: Fifth image.

Jesus. (author)apples!!!!!2009-05-05

i like apples too!!!!!!!!!

An Villain (author)DrWeird1172009-06-23

more of a flak then a shotgun.

happybirthday (author)DrWeird1172008-12-24

i wonder where we would be know if this was the first knex gun

DrWeird117 (author)happybirthday2008-12-24


no username (author)2009-09-29

RPG stands for rocket-proppeled grenade. why did you name it that?

Because it can be loaded with K'nex 'rockets'.

Knexman2020 (author)2009-06-18

Spelling mistake. Step 5, pritty (pretty) I admit i spell that wrong sometimes. Nice idea for a gun! *notice how i said something about the gun*

superdood (author)2008-10-09

could you fire your pepper grenade from this?

lord voldamort (author)2008-10-13

im modding this in to a grenade launcher.

T.E.A. (author)2008-08-24

u could put the ball of death in here (its a knex grenade look it up)

Oblivitus (author)2008-07-15

You should make a box of k`nex around it to bind it together and figure out a way to make a trigger (probably put it behind the barrel) and attach a handle as well.

mxboy14 (author)2008-06-02

+2 iv never seen any one use tires in that way before creative and cool well I'm going to steal your barrle and going to make a gun rite now!!!

Sounds interesting, I'm eagerly awaiting it.

Pumpkin$ (author)2008-03-31

+1 because real knexers are rare

Thank you.

pyroboy212 (author)2008-03-16

this would be great for airsoft. sick instructable!!

DanAlmighty (author)2007-12-29

well, im gonna post an instructable anyways but here's the preview for it. if u replace the green rods with white, and u use about 5-10 tires guess what you made? a gernade! just throw it against a wall and it will literally rain down about 50-100 white pieces. cool to play with but takes forever to put back together

awsome (author)DanAlmighty2008-02-15

That would be one of the funniest things i would have ever seen in my life!

DanAlmighty (author)awsome2008-02-17

it is very funny indeed.

GorillazMiko (author)2007-12-21

AWESOME! somehow, this is very funny to me.. but cool-funny.

Well thank you.

ferrari484 (author)2007-10-06

Nice, simple build to make.

Bright Shadow (author)2007-09-23

biggest caliber i've seen by a long shot

bowmaster (author)2007-09-07

Wow!! The only true shotgun on instructables!!

Well, only because it fires pellets.

knexpro7 (author)2007-04-06

when i tried to fire it the fire pin got stuck to the side and i already tried to do what your steps were but it doesn't work srry.. good directions though

the barrel has to be very straight but if that does not work take off the tyre on the ram

knexpro7 (author)2007-04-06

holy crap this took way to long to build but was all the way worth it!


casvandegoor (author)2007-03-17

very clear instructable! well done!

thank you

fobblewabble (author)2007-01-12

loosewire ive made a disc slinger that uses the AST rifle barrel only switch out the white connectors with yellow ones. Then just put a small tire on then sling it. It flies really good.

About This Instructable




Bio: I'm in my final year of Product Design at uni so I don't have as much time for tinkering as I'd like ... More »
More by Loosewire; SOE Operative:Covert Spy Cigarettes!Waddle Bot - K'nex BipedK'nex Semi-Auto Revolver
Add instructable to: