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How to Build a Catapult

Step 11Tie 'im up! (With Elastic?)

Tie \
Get out your surgical tubing and tie one end off on the U-bolt that you bolted to one of the posts.
Weave the surgical tubing from the U-bolt through the U-bolt on the arm, through the hole on the other post, back through the hole on the post with the U-bolt, and continue the pattern (you don't need to tie it off any more). Make your windings tight, but don't stretch it, just try and minimize slack.
Generally, 3 winds works pretty well. With a heavier bar, use 4-6 winds.
Tie the other end off either on the U-bolt attached to the post or somewhere else - your choice.

Make sure you use good knots - you don't want this slipping under high tension.
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Author:T3h_Muffinator(olopede)
I'm a just a not-so-average human with a passion for making. I see a world of hackers, makers, and producers as the sun rises in the near future. I'm starting olopede, an educational electronics k...
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