Introduction: A Super Simple K'Nex Catapult

I have been reading & building stuff off instructables for a while now. I thought it was time to contribute.

Here is my first instructable: a simple but effective catapult. it fires about 2 feet, but shoots it really high.

it uses marbles, but small sinkers work as well.

Ready to build: continue to step 1.

Step 1: Parts

Below is a list of parts. Gather them now.

Step 2: Frame

Build two of the below pictures.

Then, join them together. see last pic.

Step 3: Tensioning Mechanism.

This is a little hard to explain, but here goes.

First, set it up as shown in the first two pictures.

Then, wind a turn on until you see picture 3.

Step 4: Ammo Arm.

I don't know what to call it, but you've got to build the arm that holds ammo and fires it.

If you know what it's called, comment & tell me.

Step 5: Stabilisers.

Join the catapult ammo arm as shown in pic one.

Then, Add stabilizing rods.

Step 6: Done!

Please comment highly, and nicely, on this.

First time!

Enjoy the catapult and win your office territory back.

Comments

author
dirtbikerider78 (author)2011-10-03

nice job i made won myself base on the same design fires awsome!!!!!!!!!!!!!!!!!!!!!

author
trav1234 (author)2009-09-23

how do you put he elastic band on????

author
bosniaguy (author)trav12342011-02-22

And what gives you the impression the elastic band is male?

author
Anidion (author)2010-09-11

Well done! Good instructable :)

author
glugnar (author)2009-07-28

cool idea but i cnt get it to shoot far

author
gsmit (author)2009-04-27

its called the basket.

author
dragonoid294 (author)2009-04-26

i fixed it so it will launch 2 yards hehe its awsome

author
quesoman (author)2009-01-17

cool idea... mine wotks great

author
Owenmon (author)2008-12-08

whenever i used this, it always flipped over and broke =(

author
Whaleman (author)2007-09-10

Cool, there aren't many catapults on this site. And don't worry, after a while a lot of pieces will be bent or broken, I have broken about 20 pieces. (first and second comment unclaimable.)

author
Mepain (author)Whaleman2007-09-10

I've broken about 100...

author
Virtualgoose (author)Mepain2007-12-09

YEAH, WELL I BROKE 1,000,000,000 PIECES!!!!!!!!!!!!!!!!!!!!!!!!!!!111111111111111!!!!!!!!!11111!eleven

author
f22araptor (author)Virtualgoose2008-07-18

how did u brake that many peices

author

well i broke a rod wi;e malin this catapult!!! LOL :) :> :P ;) i heart smileys!!!!!!!!!!

author
VIPER1 (author)carrothead232008-07-06

i have only broken 1 of my knex pieces... that was when the ammo of my gun crashed into a wall at short range...

author
Whaleman (author)Mepain2007-09-10

crap. But I treat my knex with care. And my room is so hot (bout 10 degrees hotter than it is outside) that I doubt my knex pieces could break without melting lol

author
bunduk (author)Whaleman2007-09-11

why is it so hot ive broken 'bout 10-20 too

author
Da_Fudge (author)2007-10-18

If anyone has built this, please tell me. if you have any mods, i'll edit them in. Da_Fudge

author
Zenosythe (author)Da_Fudge2008-04-06

Wow, me and my friend have been working on a catapult with the same basic system of this one, though ours uses geek27's firing method of sticking a clip on the end of a pole with an orange connector. I think his (geek27) is a related Instructable

author
Zenosythe (author)Zenosythe2008-04-25

It's done! please check it out under knex catapult.

author
Zenosythe (author)Da_Fudge2008-04-06

could i have your permission to make an intructable of it? i'll be sure to give you and geek27 credit

author
Zenosythe (author)Zenosythe2008-04-06

oops, th comment above this is supposed to be below the other one. plz pm me to respond

author
gilros (author)2007-10-20

I haven't broken any, but I've bent a ton... You know what sucks? I found an ENTIRELY new design for an auto loading k'nex gun, and I can't post any Instructables!!!

author
pakman227 (author)2007-09-17

how does it work?

author
bedbugg2 (author)2007-09-11

i break lots of pieces too, i broke 5 grey rods when i made your crossbow, mepain!

author
ryan knexer (author)2007-09-10

how high does it shoot?

About This Instructable

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Bio: I like electronics.
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