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Sling Angle & WLL

The sling angle is what catches people out: legs at 30° from horizontal carry double the tension of a vertical lift. Leg tension is T = W / (n · sinθ) — never rig below 30°.

Load mass (kg)

Number of legs

Sling angle from horizontal (°)

Rope breaking strength (N)

Design factor

Pin / sheave diameter (mm)

Rope diameter (mm)

Total load

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Load angle factor

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Tension per leg

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Horizontal crush force

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D/d efficiency

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WLL per leg

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Check

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Rigging is life-safety work: follow ASME B30.9 and your site plan, use certified hardware, and never rely on a calculator alone. Shock loading can multiply these figures several times over.

A helper, not a substitute for engineering judgment. Verify against the governing standard.