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.
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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 (%)