Trebuchet Building Features
Primary Lever = Throwing arm; also called the swing arm. Has what are considered long and short ends based on the relationship to the pivot position connected to the tower frame. The long end should be 3-5 four times longer than the short end and it should be strong but light. Sufficient to hold the counterweight but yet light. Don’t try to make the board longer with the intent to increase distance…that’s not how it works. The key will be to enable the trebuchet counterweight to swing through quickly for optimal hurling distance.
Sling = A good rule of thumb is to begin with the sling harness approximately 3/4 the length of the upper (longer) end of the beam and trial for optimal trajectory. The sling length will influence projectile trajectory, causing an object to too fly high, too forward, or even backward.
Counterweight = Weight about 80 to 100 times as much as the projectile to be hurled. It can be a fixed or a free moving weight affixed to the swing arm lever (beam).
Base = Foundation on which to construct the glide track and support frame pieces. The base should be designed and constructed to firmly hold together the structure during the “whipping” transfer of energy from the release of the beam (swing arm lever) that allows the force of gravity to draw the counterweight down. It is a sudden and powerful transfer that can sometimes be offset by adding wheels to the base.
Frame = Is essentially the primary 2 side tower beams braced by supporting pieces. The height of the axle pivot point should be set so that the trebuchet swing beam is positioned about 45° when cocked and secured in the firing position. The attached counterweight should clear the tower frame sides, as well as, the “glide” or sling platform base when it travels down and through. There is an array of other terminology used in the design and building of the trebuchet, but these are the primary features that distinguish the trebuchet from other “hurling” machines (models). Discover how to easily and quickly build your own trebuchet, visit How To make A trebuchet to get access to free plans and more on key trebuchet building features.
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