A wire rope rove through two single blocks...

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Question 1 of 2066636ee728f7522a1c519034

A wire rope rove through two single blocks with two parts at the moving block is used for a boat fall. The weight of the 100-person boat is 5 tons. Compute the required breaking strain per davit (2 per boat). Safety Factor - 6, weight per person - 165 lbs., 10% friction per sheave (2 sheaves).

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Question 1 of 20

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🔍 Key Concepts

• Mechanical advantage of tackles – how many parts at the moving block and what that does to the load on the fall • Safety factor application – how to go from working load to required breaking strain • Friction in sheaves – how 10% per sheave affects the total load on the fall

💭 Think About

• First, compute the total weight of the fully loaded boat in pounds and then convert to tons to find the working load per davit. • Determine the theoretical mechanical advantage from the number of parts at the moving block, then adjust that for friction losses in the sheaves. • Once you know the maximum line load in the fall, use the safety factor to find the minimum required breaking strain per davit and compare to the choices.

✅ Before You Answer

• Confirm the total boat load includes both the boat weight and all persons aboard. • Verify how many sheaves the rope passes over and how to combine a 10% loss per sheave into an overall efficiency or increased line tension. • Make sure the safety factor of 6 is applied to the maximum line load that the davit has to support, not just the bare boat weight.

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