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Page Added on Material Properties


Posted Apr 12, 2009 by Matt | Tags: site updates

There is a new page that discusses material properties and how to design for a given stress. This aims mainly at trebuchet axles and how to pick a material to survive the stresses, and is a lead-in to a soon-to-come axle stress calculation page for trebuchets.

Tags: site updates

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Use "common sense" when operating trebuchets and catapults. Even little ones can be dangerous. Do not place anything you are not willing to lose in the plane of the arm rotation (this includes yourself, body parts, car windshields, cameras, etc). These catapults and trebuchets are capable of throwing just as far backwards as forwards, and the use of a backstop of some sort is recommended, though the use of one does not make the region behind it safe.

Also, just because the throw got away safely downrange does not mean the end of the danger. The arm is likely still swinging wildly along with the counterweight, and there is a sling whipping around. One thing many people fail to take into account is this sling; some people put a metal ring on the slip end of the sling and this ring can HURT when whipping around!

Have fun hurling, but please KEEP IT SAFE!!!