You are ordering a new block to use with a...

Question 1 / 2707066636ee728f7522a1c518504

Question 1 of 2707066636ee728f7522a1c518504

You are ordering a new block to use with a 3-inch circumference manila line. Which represents a proper size block for this line?

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Question 1 of 27070

You are ordering a new block to use with a 3-inch circumference manila line. Which represents a proper size block for this line?

🔍 Key Concepts

• Relationship between line diameter and sheave diameter in standard rigging practice • Rule-of-thumb for sizing a sheave for natural fiber lines (like manila) • Difference between cheek size (overall block length) and sheave size (wheel diameter)

💭 Think About

• First, convert the 3-inch circumference of the manila line into its approximate diameter. What simple formula relates circumference to diameter? • Once you know the line’s diameter, recall or look up the common rule-of-thumb: the sheave diameter should be how many times the line diameter for manila? • Compare that recommended sheave diameter to each choice and decide which option best matches standard safe practice for manila line.

✅ Before You Answer

• Be sure you are sizing the sheave, not the cheek – cheek length is usually larger than the sheave diameter. • Verify the circumference-to-diameter conversion before you apply any rule-of-thumb. • Check that the chosen sheave size is large enough to avoid sharply bending the manila line, which can weaken it.

Question 1 of 27070

You are ordering a new block to use with a 3-inch circumference manila line. Which represents a proper size block for this line?

9-inch cheek, 6-inch sheave

8-inch cheek, any size sheave

6-inch cheek, 4-inch sheave

At least a 12-inch sheave

Question 1 / 2707066636ee728f7522a1c518504

Question 1 of 2707066636ee728f7522a1c518504

You are ordering a new block to use with a 3-inch circumference manila line. Which represents a proper size block for this line?

Back

Question 1 of 27070

You are ordering a new block to use with a 3-inch circumference manila line. Which represents a proper size block for this line?