4 1 Pulley System

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The basic 1:1 pull. Sticky the climber needs to lift a 100 lb. Load up to her ledge. She ties a rope onto the load, and starts pulling.

If you know any 3 values (pulley sizes or rpm) and need to calculate the 4th, enter the 3 known values and hit calculate to find the missing value. For example, if pulley 1 is. A “mystery” 3:1 pulley system as is and upside down. As usual, the input force is depicted in an angle for clarity, but all elements are ideally in vertical direction. It is ideally a 3:1. Rope rescue recovery system 4:1. Saferight’s rope rescue recovery system 4:1 is a raising and lowering device designed for rescue/recovery, casualty retrieval, and confined space work. If you have a single wheel and a rope, a pulley helps you reverse the direction of your lifting force. So, as in the picture below, you pull the rope down to lift the weight up.