A 1-inch wire rope eye sling lifting a load with a sling around a 1-inch shackle will be how efficient?

A 1-inch wire rope eye sling lifting a load with a sling around a 1-inch shackle will be how efficient?

• A. 25 percent
• B. 50 percent
• C. 75 percent
• D. 100 percent

Answer: (B)

When a wire rope sling must change direction by wrapping around a pin or shackle, the rope experiences a bend that concentrates stresses and adds friction. This reduces the rope’s effective load-carrying capacity compared with a straight lift. If the bend radius is about the same as the rope diameter (a 1-inch rope around a 1-inch shackle), the loss in capacity is significant—roughly halving what the rope could normally carry. So the arrangement is about 50 percent efficient. If the bend were gentler (larger radius), efficiency would improve toward full capacity; with tighter bends, it would drop further.

When a wire rope sling must change direction by wrapping around a pin or shackle, the rope experiences a bend that concentrates stresses and adds friction. This reduces the rope’s effective load-carrying capacity compared with a straight lift. If the bend radius is about the same as the rope diameter (a 1-inch rope around a 1-inch shackle), the loss in capacity is significant—roughly halving what the rope could normally carry. So the arrangement is about 50 percent efficient. If the bend were gentler (larger radius), efficiency would improve toward full capacity; with tighter bends, it would drop further.