Cable drive 20

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Four pulleys rotate independently.
W: weight of the load
P: pulling force for moving up the load.
Mechanical advantage: 4 (number of the cable branches that suspend the weight or twice number of movable pulleys)
Pulleys velocities:
Vg = 4Vb
Vo = 3Vb
Vp = 2Vb
Vg, Vo, Vp and Vb are velocities of green, orange, pink and blue pulleys, respectively.
Upper pulleys have the same rotation direction.
Lower pulleys have the same rotation direction, opposite to the one of the upper pulleys.
Pulleys with scale, pulleys, how pulleys work, physics

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