What size sheave diameter should be used...

Question 1 / 2707066636ee728f7522a1c5188c3

Question 1 of 2707066636ee728f7522a1c5188c3

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

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Question 1 of 27070

Q

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

🔍 Key Concepts

• Recommended sheave diameter to rope diameter ratios for natural-fiber lines like manila • How too-small sheaves affect bending stress and fiber damage in the line • Difference between rules-of-thumb for natural fiber vs. wire rope or synthetic rope

💭 Think About

• If your rope is 3 inches in diameter, what is a common minimum multiple of rope diameter used to choose sheave size for manila line? • Which option looks too small to avoid sharply bending the line, and which options seem excessively large for practical blocks and tackle? • Think about what seamanship manuals suggest for the minimum sheave diameter to preserve the strength of a manila line.

✅ Before You Answer

• Confirm the typical D/d ratio (sheave diameter to rope diameter) recommended for manila line (not wire rope) in standard seamanship references • Check which choices are close to that ratio when applied to a 3-inch line • Eliminate any answer that would bend the rope so sharply that it would quickly weaken or crush the fibers

Question 1 of 27070

Q

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

A

3 inches

B

6 inches

C

9 inches

D

12 inches

Question 1 / 2707066636ee728f7522a1c5188c3

Question 1 of 2707066636ee728f7522a1c5188c3

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

Back

Question 1 of 27070

Q

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

🔍 Key Concepts

• Recommended sheave diameter to rope diameter ratios for natural-fiber lines like manila • How too-small sheaves affect bending stress and fiber damage in the line • Difference between rules-of-thumb for natural fiber vs. wire rope or synthetic rope

💭 Think About

• If your rope is 3 inches in diameter, what is a common minimum multiple of rope diameter used to choose sheave size for manila line? • Which option looks too small to avoid sharply bending the line, and which options seem excessively large for practical blocks and tackle? • Think about what seamanship manuals suggest for the minimum sheave diameter to preserve the strength of a manila line.

✅ Before You Answer

• Confirm the typical D/d ratio (sheave diameter to rope diameter) recommended for manila line (not wire rope) in standard seamanship references • Check which choices are close to that ratio when applied to a 3-inch line • Eliminate any answer that would bend the rope so sharply that it would quickly weaken or crush the fibers