|Project by BeachedBones||posted 02-03-2009 09:37 PM||3805 views||8 times favorited||10 comments|
I built this after seeing a program on the engineering of various Trebuchets. Intrigued I build this toy with what i found to be the best features of different designs. The whole rig is left on wheels to make rough aiming easier, also so it could be towed to the battlefront as opposed to being built on site as was common. A neat little benefit also is that the wheels are NOT chocked, and allowed to roll back and forth as the weight of the counterweight falls. The physics is a little tricky, but basically the weight can move in a strait line down, as opposed to an arc, making it more efficient and removing some of the shock on the frame by firing the siege engine. A basket style counter weight makes adjustments to the weight, and therefore ballistic distance. Also an empty basket is easier to ship and can be filled with spare ammo, gravel, dirt or whatever is lying around. The sling and launch arm are long to amplify the speed that the projectile is launched. The projectile sits in a guide track that pivots on one end to allow fine tuning of the aim by slightly altering the arc along the sling ropes. One side of the sling rope is fixed to the launch arm, the other end attached a little lower on a hook that is angled to release at the top of the arc. This toy is about 2 feet long and can easily launch a marble 40+ feet using other marbles as counterweight. Made of a scrap of 2/4 and some plywood for the basket.
Time to wage war on a Lincoln Log village!! (not to be used near windows :P)
-- You know.... I think that old wood needs to be furniture.