This is an hour long video of all the trebuchets firing--'better get the popcorn: http://www.youtube.com/watch?feature=player_embedded&v=1g5j78VL-Zk
Blatant Observations: -More counterweight tended to throw the object further (to a certain extent) -Bending the pin changed the projectile's flight path -The longer the sling, the further it threw -Floating arms are so much cooler -Hanging counterweights allowed A-frame trebuchets to throw further -Wheels allowed A-frame Trebuchets to roll forward and gain a bit more distance (all while saving it from self-destruction) -Mr. McChesney takes alot of video and pictures