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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.
nice job i made won myself base on the same design fires awsome!!!!!!!!!!!!!!!!!!!!!
how do you put he elastic band on????
And what gives you the impression the elastic band is male?
Well done! Good instructable :)
cool idea but i cnt get it to shoot far
its called the basket.
i fixed it so it will launch 2 yards hehe its awsome
cool idea... mine wotks great
whenever i used this, it always flipped over and broke =(<br/>
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.)
I've broken about 100...
YEAH, WELL I BROKE 1,000,000,000 PIECES!!!!!!!!!!!!!!!!!!!!!!!!!!!111111111111111!!!!!!!!!11111!eleven
how did u brake that many peices
well i broke a rod wi;e malin this catapult!!! LOL :) :> :P ;) i heart smileys!!!!!!!!!!
i have only broken 1 of my knex pieces... that was when the ammo of my gun crashed into a wall at short range...
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
why is it so hot ive broken 'bout 10-20 too
If anyone has built this, please tell me. if you have any mods, i'll edit them in. Da_Fudge
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
It's done! please check it out under knex catapult.
could i have your permission to make an intructable of it? i'll be sure to give you and geek27 credit
oops, th comment above this is supposed to be below the other one. plz pm me to respond
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!!!
how does it work?
i break lots of pieces too, i broke 5 grey rods when i made your crossbow, mepain!
how high does it shoot?

About This Instructable

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Bio: I like electronics.
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