SLING TO LOAD ANGLE EFFICIENCY
Sling working load limits whether nylon, wire rope, or chain are rated with their respective vertical, choker, and basket capacities. When selecting these slings, careful consideration must be made for the proper sling to load horizontal lifting angle. The greater angle to sling configuration will result in a reduction of sling efficiency and a loss of rated workload limits!
(A) at a 90° sling to load angle the sling is at 100% of the WLL
(B) at a 60° sling to load angle a loss of 14% efficiency occurs and the sling is capable of lifting only 8,600 lbs.
(C) at a 45° sling to load angle a loss of 30% efficiency occurs and the sling is capable of lifting only 7,000 lbs.
(D) at a 30° sling to load angle the working load limit is reduced by 50% and the sling is capable of lifting only 5,000 lbs.