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Hey everyone,

It's been on my list for a while to try to build a working ballista, and I finally took the time to do it a few weeks ago. It turned out a lot better than I thought it would. The torsion springs are built by twisting LEGO strings with studs on the ends. It can fire a 2x4 brick (or anything that fits in the channel) up to 15 feet.

I also put together instructions for it for anyone that might like to try and build one themselves: http://jkbrickworks.com/ballista

J

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