What factor is critical while determining the effective lifting capacity of a crane with extensions?

The offset angle of the jib is critical when determining the effective lifting capacity of a crane with extensions because it directly affects the crane's stability and balance during operation. Jibs, or extendable arms on cranes, can create various angles relative to the crane's base, and these angles alter the distribution of weight and tension on the crane's structure.

When the jib is offset at a greater angle, it can increase the horizontal reach, however, it may also reduce the lifting capacity due to the shift in the center of gravity and leverage. Properly accounting for the offset angle is essential for safe operation, as failing to do so can lead to tipping or structural failure of the crane.

Considering the other factors, while the weight of the crane itself and the combined weight of attachments are relevant for overall assessment, they do not directly change the lifting capabilities as influenced by the angle of the jib. The maximum height of the lift also does not specifically address the effectiveness of the crane's lifting capacity in relation to extension and angles, making the offset angle of the jib the most crucial factor in this context.