A Super Simple K'Nex Catapult

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About: I like electronics.

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.

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    26 Discussions

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    dirtbikerider78

    7 years ago on Step 6

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

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    gsmit

    9 years ago on Step 5

    its called the basket.

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    Owenmon

    10 years ago on Introduction

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

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    Whaleman

    11 years ago on Introduction

    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.)

    7 replies
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    VirtualgooseMepain

    Reply 11 years ago on Introduction

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

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    VIPER1carrothead23

    Reply 10 years ago on Introduction

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

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    WhalemanMepain

    Reply 11 years ago on Introduction

    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

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    ZenosytheDa_Fudge

    Reply 10 years ago on Introduction

    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