A one inch wire rope eye lifting a load with a one inch shackle will be how efficient?

A one inch wire rope eye lifting a load with a one inch shackle will be how efficient?

• A. 50%
• B. 100%
• C. 75%
• D. 25%

Answer: (A)

A wire rope eye that passes through a shackle creates a sharp bend around the shackle pin, which drastically reduces how much of the rope’s nominal strength can be transmitted to the load. The presence of that bend and the resulting bending losses mean you don’t get the rope’s full rated strength in this configuration. In practice, this arrangement is about half as efficient as the rope alone, so the lifting system has an efficiency of around fifty percent. That’s why fifty percent is the best answer.

A wire rope eye that passes through a shackle creates a sharp bend around the shackle pin, which drastically reduces how much of the rope’s nominal strength can be transmitted to the load. The presence of that bend and the resulting bending losses mean you don’t get the rope’s full rated strength in this configuration. In practice, this arrangement is about half as efficient as the rope alone, so the lifting system has an efficiency of around fifty percent. That’s why fifty percent is the best answer.