Introduction: Knex Light Cannon V1.0

Picture of Knex Light Cannon V1.0

Check out my new gun. Shoots over 120ft. Please comment and rate. Warning-video takes a long time to load and it is my old version. I am not liable for any damage you cause with this. It can do physical harm and will break objects in the house including the knex pieces.

Step 1: The Trigger

Picture of The Trigger

Follow the pictures

Step 2: The Body

Picture of The Body

That long part that connects the bow to the trigger. Feel free to make it longer or shorter.

Step 3: The Bow

Picture of The Bow

The part that holds the rubberbands.

Step 4: The Rubberbands

Picture of The Rubberbands

Follow the pictures. Try it first with three on each string and if that is too small use four.

Step 5: The Stand

Picture of The Stand

It is at about 30 degrees. When the bullet hits the ground over 100ft away it still has enough force to hurt.

Step 6: Putting It All Together

Picture of Putting It All Together

YAY. The best step.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!

Step 7: The Ammo

Picture of The Ammo

This is a list of all of the ammo I have tried and some basic stats about each. Distances (D) are by feet, piercing (P) is in layers of cardboard, and weight (W) is in grams.


Dj-pon3 (author)2012-05-17

nice cannon

TigerNod (author)2010-02-26

Did you tested these different types out just once, or multiple times?

i tested each type about 3 times each and took an average

Silly. Could've had a v8! *smack* lol jk.

swords45 (author)2009-05-11

mine kept on falling apart but i reinforced it and was able to handle the pressure. i still cannot figure how to load and shoot it. VERY COOL!!!!!! 20/5

knex obsessed (author)2009-05-03

i have enough pieces to make I_am_Canadian's handheld V5 cann like 10 times no joke

I_am_Canadian (author)2008-11-12

Nice! I was going to make a arrow shooter... Good work. About the "just as good" part... Thats to be decided.

Your's is better, it's a well should be a well established fact that if you want a cannon, IACs your man

:-D Thanks!

decided! yours is better, i have to say. no offence 222222222539

I didnt mean to compare them like that. I meant that mune uses 5x less pieces and is as powerful. The ammo is lighter but is more deadly(not really but it does pierce better).

Mine goes clear through cardboard as well.

Ya but does it go through 4 layers of 5 ply cardboard

Its hard to get a blunt piece of ammo 3 inches wide through that.

Well If you are talking about practicability, most people do not have enough time or pieces to make yours where in mine it takes less than 1 hour to build and uses under 400 pieces. Yes, yours is better if you have enough pieces but odds are you don't.

Thats only one thing though, and thats why I made 4 mini versions of it, which uses less of some pieces than this does.

Yes I Know but they are still similar. I just wanted to say that so more people would view it anyway. Yours are bigger and better but for a first gun mine is pretty close.

They are both good in their own ways.

Yes they are but I built yours finnaly (the handheld) and it still uses a ton of piesec and weighs 3 pounds. It shoots far and has a lot of power but it is strong. I still think it uses a little too many pieces for a handheld.

maid63 (author)Electroinnovation2008-11-28

so, who wants cookies?

Oompa-Loompa (author)maid632008-12-12


maid63 (author)Oompa-Loompa2008-12-14

fresh out of the oven! here you go one for you oh, yes you way in the back and for all of you!

TwistedParadox (author)maid632009-04-22

Yummy! I love cookies (cookie monster steals cookie) Waaaaaaaa! So instead of cookies I now get a 'Mudkipz'

Oompa-Loompa (author)maid632008-12-14

I feel important.

maid63 (author)Oompa-Loompa2009-01-02

cookies can do that XD

Oompa-Loompa (author)maid632009-01-02


pimmy65 (author)maid632009-04-21


And I was wondering if we could help each other out by posting a link of each others design on our instructables. It would help us both by views and rating. If you don't want to its ok but it would help you.

And I sure hope you built it before you started criticizing me.

Did I ever say anything wrong about this gun?

I like bothe of yours, but i m going to have to go with Canadians's. (remember this is coming from the mind of an OK knex gunner so dont take it to seriosly.(hehe i said come) )

LoL Thanks

lemme be tie braker...the winner is...I_am_canadian

An Villain (author)2009-03-22

where is the dwp stats on the ammo?

frag master (author)2009-02-28

nice ballista, i myself am working on a knex omager. I am going to use the ballista you made in my school report. ALL CREDIT GOES TO YOU!!!!!

Thanks. What is the report going to be about?

the report is on Greek and Roman catapults. I do have a little problem though, whenever I go to pull back the rubberband, the whole thing breaks apart. this happened the night before the report. therefore, I had to build something else. I am still trying to get it to work however. is there any way to prevent it from "blowing up" again? Frag Master ;)

I am so sorry. The only two solutions are to make the rubberband strings longer or make V2 which is stronger.

I_am_Canadian (author)2009-02-12

Shouldn't that green rod in the middle of the top be a white?

It should be but I messed up the wheel rod. Look at V2.2 to see how to fix that.

ShanDom (author)2008-12-23

how do you shoot it??? if i pull back the rubber bands to the trigger the back of the cannon breaks off

That was why I built a second version. My only recomendation would be to add some rubberbands so it is a little looser.

leon0862 (author)2008-12-07

this rocks rofl's now i can hun my sister down

If you want her to scream louder build V2.2 Its sooooooooooooo much better.

Electroinnovation (author)2008-11-28

Ya great way to try and spam but too bad.

Bartboy (author)2008-11-12

the reason I A Cs is better is cause t shoots larger ammo

pls (author)2008-11-12

I don't know if you can say just as good as his heavy cannon, they both shoot different things, although this seems to be realllly powerful in the vids:) Awesome! 5*

About This Instructable




Bio: I have moved on to better things...aka YouTube. So I will most likely not reply to any comments, sorry for any inconvienience. If you ... More »
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