Which line is the sling to load angle measured against?

• A. The horizontal line
• B. The vertical line
• C. The centerline of the load
• D. The ground line

Answer: (A)

The line used to measure the sling to load angle is the horizontal reference line. This is the standard way riggers define sling angle: each sling leg forms an angle with the horizontal, and that angle determines how much tension each leg must تحمل. If the sling is vertical, the angle from horizontal is 90°, giving the lowest tension per leg for a given load; as the slings move toward the load (closer to horizontal), that angle shrinks and the required tension increases dramatically. So the sling-to-load angle is measured against the horizontal line, not the vertical, the centerline of the load, or any ground reference.