Deck General · Blocks & Tackle
Ignoring friction, the mechanical advantage of a tackle is determined by:
- AThe number of parts of line at the moving block✓ Correct
- BThe diameter of the sheaves
- CThe breaking strength of the rope
- DThe length of the fall
Explanation
Theoretical mechanical advantage equals the number of parts of the fall supporting the movable block. Friction (about 10% per sheave) reduces the actual advantage.
Authority: Knight's Modern Seamanship
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