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We found a bunch of old 4 by 4s behind my friends garage and having just watched lord of the rings the night before we decided to build a catapult. it took us the better part of a day to build (we made our own plans).
When we were tightening the rope that throws the arms it took 3 people to pull on the tightening thing we made (a long metal pipe with a clamp on the end). All said and done we were shooting rocks about the size of your two fists together 125-150 feet and rocks the size of one fist well over 175 and a few broke 200.
if the pictures dont work there in my profile also
