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- Q158 - Navigation and Deck General/Safety
152. You are using tackle number 12 shown in illustration D029DG below to lift a weight of 300 lbs. If you include 10 percent of the weight for each sheave for friction, what is the pull on the hauling part required to lift the weight?
The mechanical advantage of tackle 12 is 7:1. Including 10% of the 300 lb weight for each of the 6 sheaves results in an effective load of 480 lbs, requiring a pull of 480/7, approximately 69 lbs.
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