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Are you saying that fluid pressure contained by the green line will make the screws turn?
QuoteAre you saying that fluid pressure contained by the green line will make the screws turn? No, I'm not saying that.I would like to know if for you the unique thread on reply #20 (drawing) turn and give torque ?
ok, the screw turn and give torque, the sum of energy is 0 and there is friction.
There is no need to go any further.
What is suppsed to happen when the screws are rotated?