Artillery

[Emperor James]

I'd check out the various creations by James Brinks:
http://www.mocpages.com/home.php/652
Look at the Black Falcon's Trebuchet, the two Crusaders' Trebuchets, and the Onager. He's got instructions for one of them here:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=71131

I also like this one by "Emperor-James" and recently built a version based on it:
http://www.brickshelf.com/cgi-bin/gallery.cgi?f=92515

Or you could go more minimalist like this by Dark Admiral:
http://www.brickshelf.com/cgi-bin/gallery.cgi?i=779219

Bruce

That catapult is the second prototype a catapult which I have now finished. Maybe I'll find time to post the first prototype and the finished catapult later.