![]() I'm not sure what is likely to make this fail. The swivel allows the pulley to rotate sideways too so that the tension in the rope always pulls it down into the groove and not against the side of the groove. If the pulley were rigidly mounted on the ship then the pulley would rotate sideways while the tension in the rope (suspending something?) stays vertical or in another context the load might swing sideways. The reason for having a fairlead is that there are lateral forces tending to pull the rope sideways wrt the pulley, e.g. The tention on the cable will rise during heeling, resulting in greater force. Im not quite shure however, and im struggling to theoretically prove which design is better to keep the cable in the groove. When the cable slips and travels up the grooved walls, the force acting on the fairlead from the cable will due to the momentum from the forces distance to the rotation axis move the block. My view is that the cable will stay in the groove and rotate around the fixed axis with the fairlead, as long as the static friction between the cable and groove surface is equal to the applied force.
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