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im not familiar with the book but if x>a would the load be off the beam? or is the starting point a and the ending point b, so that if x>b then the load is off the beam?

weeding out is good for two reasons i think: 1) engineering isnt always a cake walk. there is a lot of thinking and effort that has to be put into each design problem. if someone drops out of a class because it was "too hard" then good riddance. if you cant handle a difficult...

DaveViking- its just for playing around. here is the site i used to get the basic design. i modified it a little. http://www.io.com/~beckerdo/other/trebuchet.html#theory i made mine in about 3 days (from lumber store to firing) and i used a normal 1x4 and ripped it down with the table saw...

pylko- i dont know the force in the spring. my goal is to find out how much stress the arm can handle, and then use a spring accordingly. thats the part i am confused about. uts, flexure modulus, youngs modulus, i dont know which to use or how to use it. thanks for opining though.

also, i realize this is more of a dynamics problem with all of the rotation and forces and whatnot, but i was looking for more of a static solution. like when the arm is cocked and ready to fire, what stress can it withstand without breaking. from this, i believe i can "dynamicsafy&quot...

i appreciate your input, but the trebuchet is already built. so i can't really change the pivot design without rebuilding the whole thing. im entering my senior year at college so i should know how to do this but for some reason im drawing a blank.

Pivot [] [==============] load [=======================] projectile [==============] {----5in----} {---------8.5in--------} {-----------------17in-----------------} Everything is 3/4in by 3/4in northern white pine glued together and pinned with dowel...