Picture of Knex Catapult
A Catapult made from Knex
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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.
i modded it to make it pocket size
cad975 years ago
This is really cool, i put 3 bands on mine and it will shoot a lego about 9 feet.
you shold try to make a knex trebuchet. a few raesons why.
  • it would be awesome
  • you make realy good instructables.
HarryG321 (author)  colethemle7776 years ago
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
very good instructable
pk_excel6 years ago
it's a good grenade launcher. Perfect for a booby trap!
dazakazam6 years ago
i modded it to a sort of bear trap thingy, lol i'v been annoying by cat=]
Vynash7 years ago
very good and awesome instructions 4*s
HarryG321 (author)  Vynash7 years ago
no problemo