This is a very complex formula, however to simplify matters, we have illustrated simplified various rigs below and shown the various loads as percentages of the entire load at each point.As you can see from the top image with two points, each point carries 50% of the load. The rigger in this case incorrectly assumed that the three motors would share the load between them equally and didn’t take into account the. Thinking with 3 motors rated at 500kg each there would be no problem, to his dismay, the truss comes crashing down, centre point first.The reason this didn’t work in our imaginary scenario is due to multi-point beam load calculations that he failed to account for.
As it has been a popular source for customers to source their hired rigging equipment, we decided to give some advice for when hiring and, as you need to know the rigging weight loading calculations involved.Lets take an imaginary scenario that a rigger has suspended a truss on it’s two end points, each motor is rated at 500kg, however the evenly distributed load on the truss is 1,300kg, so the rigger attaches a third 500kg rated motor to pickup the centre of the truss.
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