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Rigging With Lifting Blocks

rigging block1. Total Load
Total Load:
Load Wt. (1000 lbs.)
+ Winch Pull (1000 lbs.)
= 2000 lbs. minimum

2. One Part of Line

No Mechanical Advantage = One
Winch Pull = 1,000 lbs.

lifting block rigging1. Total Load
Total Load:
Load Wt. (1000 lbs.)
+ Winch Pull (500 lbs.)
= 1500 lbs. minimum

2. Two Parts of Line

3. Total Load = 1,000

Mechanical Advantage = Two
Winch Pull = 500 lbs.

Required Pull of blockPull (P) required (level ground)
= Weight (W) X Friction Factor (F)

Many surfaces have a friction factor < 1
(f) for steel on steel is .16 lubricated
(f) for steel on steel is .8 clean
(f) for wood on metal is .2 To .6 clean
(f) for wood on wood is .25 To .5 clean

winch block

Winch Pull Required =

Weight X Friction Factor
Mechanical Advantage

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