Disclaimer: The calculations on the Rig World site are intended for professional riggers who understand them and know how to interpret the results.  Neither Ben Kilmer, Rig World or its affiliates make any claims or warranties about the accuracies of the results from these calculations.  Anyone using these pages accepts full responsibility for how they use the results and agrees to hold Ben Kilmer, Rig World and its affiliates harmless for any errors or results of any errors that may result from the use of these calculations.