Here’s a simple but effective design for a water balloon launcher using surgical tubing –
Make a wicked cool catapult that shoots water balloons really well without them exploding right away! You can buy water balloon shooters in stores, but they never work well and explode the water balloon as soon as you let go.
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Johnny Lee used a design very much like this one a few years back as a send-off project for an apartment building that was scheduled for demolition. Details on his page here: http://www.cs.cmu.edu/~johnny/slingshot/