We're tuning the Trebuchet. In this shot, the pin is set, pointing too far forward, which results in the release being too late, giving a flat trajectory to the volleyball.
Counterweight = 90 lbs approx, maximum counterweight 500-600 lbs when filled with gravel and sand.
Some hints on construction can be found here:
http://www3.telus.net/public/royway/
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