Question 1 of 2921866636ee728f7522a1c5188c3

What size sheave diameter should be used with a 3-inch manila line?

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Question 1 of 29218
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What size sheave diameter should be used with a 3-inch manila line?

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🔍 Key Concepts

• Manila line is traditionally designated by its circumference. • A sheave is selected using the customary relationship between its diameter and the manila line’s stated circumference. • An undersized sheave bends natural-fiber line too sharply and can damage the fibers.

💭 Think About

• First identify what the stated 3-inch line measurement represents; do not substitute line diameter for that stated measurement. • Apply the seamanship rule of thumb using that same measurement basis. • Compare the resulting sheave size with the listed choices.

✅ Before You Answer

• Did you treat the stated manila-line size as circumference? • Did you use the manila-line rule rather than a wire-rope or synthetic-rope ratio? • Does your selected choice match the calculated sheave diameter?