How do angles of attachment affect sling loads?

• A. Angles of attachment
• B. Center of gravity
• C. Estimating the weight of the object
• D. Safety considerations

Answer: (A)

Angles of attachment determine how the load is resolved through each sling leg, which tells you how much tension each leg must carry and how much load is placed on the anchors. When you lift with sling legs that form a smaller angle relative to vertical, the legs share the weight more easily and the required tension in each leg is lower, making the load on the attachments smaller overall. As those angles open wider away from vertical, each leg must pull harder to keep the object up, so the tension in every leg increases and the total load on the anchors rises. In a simple two-leg setup, the tension in each leg grows roughly as the weight divided by the cosine of the angle from vertical, meaning the farther you move from vertical, the more you demand from the sling and anchors. This is why keeping attachment angles smaller improves mechanical advantage and reduces stress on slings and anchors. The other topics—center of gravity, estimating weight, and general safety considerations—describe related ideas but don’t directly explain how changing the attachment angles changes the sling loads.