What is a critical angle range considered bad in anchor systems?

In anchor systems, a critical angle range of 90° to 120° is considered problematic because it places considerable stress on the anchor points and can significantly reduce the effective load-bearing capacity of the system. When the angle between two anchor lines is too wide, which is the case in this range, it increases the load experienced by the anchors, resulting in potential failure points. In addition, this angle can lead to a decrease in the overall efficiency of the rigging system, where more force is directed towards the anchors than is horizontally directed to the load.

In contrast, angles less than 30°, between 30° to 45°, or greater than 120° have different implications on load distribution and system effectiveness. Angles less than 30° typically do not add excessive strain to anchor points, while angles between 30° to 45° are often considered optimal for balance and load sharing. Angles greater than 120° can also introduce significant risks, but they can sometimes be viewed differently based on specific context. However, the 90° to 120° range is most widely recognized for its particularly detrimental effects on anchor integrity, which solidifies its stance as a critical angle range to avoid in rescue scenarios.