To figure the pull on a snatch block you count the lines going to it and use this number as a multiplying factor. A snatch block does not always double the capacity of a winch. Since many will disagree with that I will say it again. A snatch block does not always double the capacity of a winch. Sometimes a snatch block only changes the direction of pull. The angle between the 2 lines also needs to be figured in the calculation.
Here is a simple calculator. This shows what is needed to move 12,000 lbs of weight. Notice in the left picture you need a 12,000 winch and a 24,000 snatch block just to move 12,000 lbs. But in the second picture from the left you need a 6000 lb winch and 12,000 lb snatch block to move this same 12,000 lbs.
So there are many calculations that go into winches; snatch blocks; and line pull force. But for the lay person if you have a 12,000 winch you need a 24,000 lb WLL single sheve snatch block.
Also be very careful when buying a snatch block. Lots of cheap snatch blocks are sold as "Capacity". 12 ton capacity. Capacity equals breaking strength not WLL working load limit. You need a snatch block with a 24,000 lb or 12 ton WLL not a 12 ton capacity.
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Today's Featured Article - A Brief History of Tractors in Australia - by Bob Kavanagh. After Captain Cook's exploration of the east coast in 1770 the British Government decided to establish a penal colony in Australia. The first fleet arrived in 1788 and consisted mainly of convicts who were poorly equipped and new little of farming techniques. The colony remained far from self-supporting and it was not until the early 1800's that things started to improve. Free settlers started to arrive, they followed the explorers across the mountains and where land was suitable set up farms. T
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