The video goes into a lot of detail about other fine-tuning of a trebuchet like this, aided by some slow-motion video analysis. This is the point where the forces acting on the arm from the projectile and the weight are balanced, and moving this point to allow the projectile to release at a 45-degree angle was needed for maximum distance. More fine tuning of the trebuchet was needed before the competition, though, specifically regarding the stall point for the trebuchet.
The rules of this contest allow for the use of springs, so is adding a spring in between the trebuchet arm and the weight in order to more efficiently deliver the energy from the falling weight. Trebuchets distinguish themselves amongst other siege weapons by using a falling weight to launch the projectile. The weight of the entire device is limited to no more than 3 kg, with any physical dimension no more than 300 mm, but that’s more than enough to send an egg flying across a yard with the proper design and tuning for maximum distance. The egg-launching trebuchet contest that is entering, on the other hand, has a few limitations that dramatically decreased the size of the machines involved. Without any sort of restrictions on designs for trebuchets, these medieval siege weapons are known to send 90 kilogram projectiles over 300 meters.
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