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Free is good in the neighborhood

a what? ........ like a catapult?
Better. It incorporates a counter weight and
a sling.
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You can build them in all different sizes.
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It's one of the weapons used for punkin' chuckin' contests although air cannons are supreme.
 
You can also build a trebuchet with duct tape...


(You'll note the counterweight used...)

Here's a how-to, complete with measurements, ratios, and torque outputs:

 
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