How does spreading the bars apart on a Brake Bar Rack affect descent speed?

When the bars of a Brake Bar Rack are spread apart, the increase in space between them affects the frictional resistance encountered by the rope. Greater spacing reduces the amount of contact between the rope and the individual bars, which in turn decreases the friction that helps to slow down the descent. As a result, with less friction to counteract the force of gravity, the descent speed will increase.

This dynamic illustrates the critical balance between rope friction and descent control in rescue situations. Proper understanding and adjustment of the spacing of the bars are essential for maintaining safe and controlled descents. If the bars are too widely spaced, the lack of sufficient friction can lead to an uncontrolled descent, which is a primary safety concern in rope rescue operations.