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Question 414 of 5,076

You are lifting a 5-ton weight with a single whip rove on a swinging boom set at an angle of 20° to the horizontal. Use the formula for the size of a shackle with a safe working load and determine the minimum size shackle that should be used to secure the head block to the boom.

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Comments from mariners who studied this question.

Bi Bikis22 · Dec 3, 2015
what is the formula for this question?
sh shanepmace · Jan 12, 2017
Is the formula 3d squared where d is the díameter of the schackle?