This is a simple 10 minute catapult that I built using the 521 piece K'NEX set. Using a strong rubber band I have been able to fire a marble about 20 feet.

Step 1: Parts list

Here's a parts list.

4 red rods
3 yellow rods
3 bendable orange rods
2 white rods
11 green rods

6 grey 45 degree connectors
6 red 90 degree connectors
4 green 135 degree connector
4 orange connectors
2 grey sliding connectors
2 blue sliding connectors
2 purple clips
2 tan connector clips
2 back rod clips
1 small gear
Hope it's good enough to win a prize in the contest.
Don't misunderstand me, but I think this will not win a price. It's not very innovative, <br>and almost everyone could build this. <br>But no offense I like it anyway! :)

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