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Seeing as how a deuce winch is rated for 10,000# line pull you're going to need a 20,000# (10 ton) snatch block because you're doubling the pull force when you use a two part line.
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this is what I think. you can see on the mile marker block (I have one at home) it is 24k. exactly twice what the 12k winch is rated for. I dont understand how the military can match up a block rated for 10k with a winch rated for 10k. maybe they mean the block is rated for a 10k winch??????m16ty said:Seeing as how a deuce winch is rated for 10,000# line pull you're going to need a 20,000# (10 ton) snatch block because you're doubling the pull force when you use a two part line.
I'm thinking maybe that they rate snatch blocks as to what line pull you have with a single line but that doesn't seem right either. If a deuce winch is pulling it's rated load though a snatch block and the load is hooked to the hook in the snatch block there will be a 20,000# load on the snatch block ( minus a little due to the resistance of the wire rope going around the pulley).rizzo said:1)ok why would the military put a 10k snatch block on a truck with a 10 k winch that will pull 20k when using a block?????
2)why put a 10k winch on a 13-20 k truck?
I have some ideas. what do you guys think?
I don't think you understand what we are saying. 10k on the winch line x2 creates 20k pull force. so that puts 20k of force on the snatch block (you cold think of it at the hook of the block). the rating on the block is only 10k. unless the rating is saying that that block goes with a 10k rated winch???Boatcarpenter said:m16ty- check this link and pretend that instead of the pulley system working vertically, it is in a horizontal plane and I think you can see why you can safely winch more than the winch is rated for with proper rigging and snatch blocks rated at 6 or 8 tons. I wouldn't use one only rated at 5 tons.
http://www.howstuffworks.com/pulley.htm
BC
yesm16ty said:rizzo, I think you and I are on the same page.
In a "bock and tackle" configuration (which is what you have when you use the snatch block) you will double your pulling force by hooking the load to the snatch block hook and hooking the end of the winch line back to the truck. If you hook the snatch block in a tree to lift something vertically all you have done is changed direction of the pull force, the pull force didn't increase, but you still doubled the force on the block.
Bootcarpenter, I've been around cranes and rigging most of my life and know all about how to increase pull/lifting force with snatch blocks and pulleys. You just count the number of lines between the load and the attachment point and multiply that by the line pull and you have the total lifting/pulling force.
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