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- Master & Mate (Oceans or Near Coastal (Limited Tonnage: Less Than 200 GRT)) »
- Q150 - Deck General
157. How much weight can you lift by applying 100 lbs. of force to a twofold purchase rigged to disadvantage (do not consider friction)?
A twofold purchase, using two double-sheave blocks, provides four parts of line supporting the moving block, resulting in a 4:1 mechanical advantage. Therefore, an applied force of 100 lbs. can lift a weight of 400 lbs. (neglecting friction).
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