Multiple Pulley's Lifting Mechanical Advantage

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The following are the equations and calculator to determine the lifting forcing and velocity ratio of a differential pulley.

lifting forcing and velocity ratio

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Force to Raise Load:

F = eW/(VR)

Velocity ratio VR = 2/[1-r/R]

Where:

W = Load (lbs, N)
F = Applied force (lbs, N)
r = Radius (in, mm)
R = Radius (in, mm)
e =efficiency (%)

 

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