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To calculate the stress on a specific sling leg, you multiply the load carried by that leg by the LAF. Never operate below a 30° angle without professional engineering approval.
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WLL=MBSDesign FactorWLL equals the fraction with numerator MBS and denominator Design Factor end-fraction To calculate the stress on a specific sling
When slings are used at an angle, the tension on each sling increases significantly.
An incorrect CG calculation leads to tilting, load shifting, and potential structural failure. Crane Mat and Ground Bearing Pressure (GBP) An incorrect CG calculation leads to tilting, load
SAF=Sling LengthVertical HeightSAF equals the fraction with numerator Sling Length and denominator Vertical Height end-fraction
Understanding these fundamentals allows you to cross-reference your manual calculations with the data found in high-quality PDF resources. As the sling angle decreases relative to the
Calculating how the angle of the slings increases the tension on each leg. As the sling angle decreases relative to the horizon, the tension forces multiply exponentially.
A textbook that breaks down complex entertainment rigging (theatre and arena) calculations into easy-to-understand concepts. It includes hints for remembering formulas and is a great resource for the Entertainment Technician Certification Program (ETCP) rigging exams.
By utilizing trusted, peer-reviewed engineering documentation, you ensure that your lift plans meet the highest standards of safety, quality, and regulatory compliance.
Unsafe. Upgrade to ⅝" wire rope or reduce the bridle angle to 60°.
