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Electric hoists such as this one http://www.builderauthority.com/product/6013242/ commonly have two load capacities depending on whether a single-line or double-line configuration is used. What is it about the double-line configuration that allows the load capacity to be doubled?

Thanks in advance.

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  • $\begingroup$ The principle of the lever. Also applies when pulleys are used to multiply forces. $\endgroup$ – Brian Drummond Feb 21 '17 at 9:51
  • $\begingroup$ of course its spec'd like that because they have actually included the pulley in the package ( Or maybe they included the pulley so they can advertise twice the actual winch capacity.. ) $\endgroup$ – agentp Feb 22 '17 at 19:44
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What is it about the double-line configuration that allows the load capacity to be doubled?

Because the lifting force is literally split between 2 cables. One to the static anchor and one to the hoist's winch.

enter image description here
(image source: wikipedia)

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