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2-6 Day Kayaking Trips
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Advice, Suggestions and General Help New Topic Printer Friendly Version

  That's right
  Posted by: carldelo on Jun-24-13 10:04 AM (EST)
 

You have it right re: compound pulleys - my mistake, and I'll fix my post above.

Mechanical advantage depends on the number of pulleys, but also their layout, not every four pulley system will give 4:1 advantage. A pretty simple graphic analysis will reveal the ratio. Draw a box around the load and any pulley attached directly to it - the number of ropes leaving the box divided by the number of hoist points gives the ratio.

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