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It is inevitable that some inaccuracy results when estimating the center of gravity of an object, which
can be considered an offset between its predicted, and actual position. Along with the design of the
rigging arrangement the shape of the flounder plates has a significant effect as to how well the slings
forces are balanced, and the resultant angle of the lift. Flounder plates that have a low aspect ratio, as
shown on the left in Figure 23, will typically result in lower sling tensions and less angular rotation of the
object lifted, due to an offset of the estimated center of gravity. It therefore can be readily concluded
that flounder plates with low aspect ratios are better for use on single crane lifts.
Figure 23.
Inaccuracy in COG Estimation Results in Rotations
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