Pulleys adjust the cable harness system as forces act on the dome, thus constantly maintaining even force distribution. This alleviates a tremendous amount of pressure and force the fabric must handle, thus extending the durability of the fabric envelope.
As a result, Broadwell’s domes have a useful life around 5 years longer than domes without our full cable harness system. Other domes that have only a few cables to reinforce the fabric do not distribute forces evenly, and don’t provide any reinforcement to the fabric corners of the dome.
The dangerous problem with this is that the fabric alone cannot handle nearly the internal pressure as when it is reinforced by the cable harness system. One of the simplest and clearest illustrations of this is Broadwell’s test of how much pressure a balloon can handle when inflated alone, then when reinforced with a netting similar to our cable harness system. As you can see from the pictures, the net reinforcement nearly triples the balloon's ability to withstand internal pressure. You can view a video of this balloon test below. This is critical when understanding how much snow load a dome can handle.