What is the relationship between raising the boom and load radius?

The correct understanding is that raising the boom decreases the load radius. When the boom is raised, its angle with respect to the ground increases, which effectively shortens the horizontal distance from the center of rotation (the pivot point of the crane) to the load being lifted. This horizontal distance is what is referred to as the load radius. As the boom elevates, the vertical component may increase, but the horizontal reach is reduced.

Understanding this concept is crucial for rigging and hoisting operations, as it directly impacts the crane’s ability to lift loads safely and efficiently. Knowing how the boom angle influences the load radius helps operators assess the stability and maximum lifting capacity of the crane given its configuration at any moment during an operation.