For a fixed snatch block... This only changes the direction of pull and puts double the weight on the snatch block. For a 2000 lb item the line from the item to the block sees 2000 lbs and the line from the block to the winch sees 2000 lbs. Hence the snatch block sees 4000 lbs.
For a moving block.... Here the line from the snatch block to the fixed point sees 1000 lbs and the line from the block to the winch sees 1000 lbs. Hence the snatch block sees 2000 lbs.
As the angle of the line changes the equation to figure the line pull also changes.
A easy way to figure it is the count the lines hooked to the item you are trying to move. And a single pully snatch block always sees twice the line pull since it has two lines to it.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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