In the sling calculation example, what is the angle factor (AF) used?

In the sling calculation example, what is the angle factor (AF) used?

• A. 0.75
• B. 1.0
• C. 1.73
• D. 2.0

Answer: (C)

Sling angle affects how much of the load each leg must carry, and the angle factor is the trigonometric amount you use to account for that geometry. When the load is supported by two sling legs that spread apart, you resolve the load into components along the directions of the legs. The resulting factor depends on the angle between the legs. In the sling calculation example, the geometry leads to a 60-degree angle in the force-resolution setup, so the angle factor is tan of that angle. Tan 60 degrees equals sqrt(3), about 1.73. That is why 1.73 is used—the angle makes the effective required sling capacity larger than a vertical lift due to the spread. The other numbers would correspond to different angles or configurations that aren’t present in this example.

Sling angle affects how much of the load each leg must carry, and the angle factor is the trigonometric amount you use to account for that geometry. When the load is supported by two sling legs that spread apart, you resolve the load into components along the directions of the legs. The resulting factor depends on the angle between the legs. In the sling calculation example, the geometry leads to a 60-degree angle in the force-resolution setup, so the angle factor is tan of that angle. Tan 60 degrees equals sqrt(3), about 1.73. That is why 1.73 is used—the angle makes the effective required sling capacity larger than a vertical lift due to the spread. The other numbers would correspond to different angles or configurations that aren’t present in this example.