Introduction: Knex Catapult

Picture of Knex Catapult

A Catapult made from Knex

Step 1: What You Need

Picture of What You Need

You will need:

1 Yellow Rod
4 Blue Rods
4 White Rods
1 Green Rod

6 Red Connecters
2 Yellow Connecters
4 Single Grey Connecter/Stopper things

2 Halves of a Broken Yellow rod (optional - I broke one and found it made a good trigger)

1 Elastic Band

Step 2: The Base

Picture of The Base

Assemble the 2 halves of the base (pic 1)

Join them together with the yellow connecters, but put the elastic band over one of the white rods (as shown in pic 2)

Step 3: The Arm and Axle

Picture of The Arm and Axle

Assemble the arm

Step 4: Assembely

Picture of Assembely

Step 5: Optional Trigger

Picture of Optional Trigger

Pull back the catapult arm, and slot half of a yellow rod into the yellow connecter to hold the arm back. Do the same for the other side.

Load up the catapult then pull out the pins to fire.


tailsdollart (author)2010-12-13

i modded it to make it pocket size

cad97 (author)2010-07-17

This is really cool, i put 3 bands on mine and it will shoot a lego about 9 feet.

colethemle777 (author)2009-05-18
you shold try to make a knex trebuchet. a few raesons why.
  • it would be awesome
  • you make realy good instructables.
HarryG321 (author)colethemle7772009-05-19

Thanks for the comment! A trebuchet would be awesome but I don't have much Knex... :S I'll have a look and see what I can make

colethemle777 (author)2009-05-18

very good instructable

colethemle777 (author)2009-05-18
pk_excel (author)2009-05-17

it's a good grenade launcher. Perfect for a booby trap!

dazakazam (author)2009-01-10

i modded it to a sort of bear trap thingy, lol i'v been annoying by cat=]

Vynash (author)2008-06-03

very good and awesome instructions 4*s

HarryG321 (author)Vynash2008-06-03


Vynash (author)HarryG3212008-06-03

no problemo

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