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(OP)
Hi Folks,

Hungry Dinosaur

You have 4 unknowns in the sling load in each leg. You can set up a system of equations, sum in x direction = 0, sum in Y direction = 0 and sum in z direction = 0. The fourth equation is the skew effect, but in answer to your question, sum of vertical loads in one pair of diagonal slings - 50% total lift weight (ie a skew factor of 1.0). You can then solve for your sling forces and then compare the %'age difference in each leg due to your offset.

Without using load eveners (pulleys or levers) on the support cables you can easily have 100 percent of the load on only two cables. If you rig 4 cables of equal length as shown in the OP. The load will tilt when lifted so the cg is under the hook, and one cable will have zero tension. The problem is indeterminate without some extra rigging.

Rather concerned that you are distributing 25% load on each when requirements for the design of a 4 leg sling, in accordance with EN 13414-1 : 2008, Steel wire rope slings - Safety - Part 1: Slings for general lifting service. This code is recognised as complying with the EEC Machinery Directive. This method is intended to be used for a equal leg length sling, but can be used for unequal leg length slings. see attachment.

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