The optimal sling angle is 90 degrees —this is when the sling is completely vertical, placing no additional tension on the sling. However, ideal lifting scenarios are rare. Therefore, for most lifting projects, 60° is the desired sling angle for the operator.

Given that, the most desirable angle of lift is one that approaches 90 degrees. The inverse relationship between the angle of lift and sling tension also dictates that lifts with angles of less than 30 degrees from horizontal are not recommended.