Electric winch question

rrman61 · Mar 14, 2022

I have a 12000 pound 12 volt electric winch.what would the lifting capacity compared to rolling load be for this winch be?I also use a single snatch block with it to potentially depending on how its rigged double the capacity .I have a 20 ft con-ex container weighing around 7000 pounds I want to load onto a 3plus foot high flatbed trailer.I have done this before but had to jack and block one end up to the trailer height.thinking about installing a roller on the very back of the trailer so
I can suck the container up and onto the trailer

WNYBill · Mar 14, 2022

Using a snatch block you should double the capacity to 24,000 pounds. But, how are you going to lift it? You could use a gin pole. You will lose some capacity through friction. Just be very careful.

john in la · Mar 14, 2022

[b:654c4848f0]depending on how its rigged double the capacity[/b:654c4848f0]

At least you understand that a snatch block does not always double capacity.
Most do not understand this.

Steve@Advance · Mar 14, 2022

If you can find the owners manual, it will probably have the capacities listed.

Remember the more layers of cable on the spool, the more the capacity gets derated. There is also a duty cycle to consider. Using a compound almost doubles the pulling capacity, but it also doubles the run time. Every bend, or pulley adds friction which reduces the capacity. If the gearbox contains liquid oil, that is a consideration for allowed positions.

It doesn't matter if it's lifting or dragging, the capacity of the winch is the same as long as there is a straight pull on the spool.

moresmoke · Mar 14, 2022

Your winch should have 12000 lbs of line pull on the bottom layer of cable on the drum. Depending on the manufacturer of the winch, the rating may be optimistic. As you wind more layers of cable on the drum, you loose line pull, as much as half to a full drum. Once again depending on the winch design. The better winches tend to have longer thinner drums, while the cheaper ones has shorter taller drums.

rrman61 · Mar 14, 2022

I plan on installing a 8 to 10 inch roller on the very tail of the trailer and attaching a heavy chain to the existing skids on the container I will then hook my snatch block to.basically doing it like the old style 18 wheeler low boys were re-hooked using the truck winch-sucked up and on.I know this will work because I have experience doing this I just didnt know if my winch was strong enough

wingnuttx · Mar 14, 2022

Could you not borrow a medium size ( whatever that is) piece of construction equipment with a bucket to position itself on the back end of the container to lift and push. That with the pull of the winch should do the trick right. Wingnut

cjunrau · Mar 14, 2022

As I understand those winches are rated at max lift capacity. So 12000 lbs is 12000 lbs lift. Double with a snatch pulley less friction. A1500 lbs quad winch can lift 1500 lbs. I use one for beef all the time. I just find they only like to run under that load for 10-20 seconds then give them a break.

rlp in Co. · Mar 14, 2022

I used a piece of drill stem for my tail roll. It is made of 3/8 inch steel. I have loaded some heavy stuff on it.

DoubleO7 · Mar 14, 2022

What are these existing skids on the container you mention?

Standard container construction consists of the C channel outer rails with perpendicular crossmembers.

I am not too confident that those side rails would not collapse if all the weight was in a single in between the crossmembers at the teeter totter point.I

Your roller would have to be at least 8.5 feet wide or so to pick up the side rails of container.

Some have gooseneck tunnel at dead end but they don't go very far underneath.

Bret4207 · Mar 15, 2022

(quoted from post at 11:58:52 03/14/22) [b:5d3b551d98]depending on how its rigged double the capacity[/b:5d3b551d98]

At least you understand that a snatch block does not always double capacity.
Most do not understand this.

I'm having a hard time understanding how a single block can ever double the advantage. I was taught all a single block can do is change direction of pull.

rrman61 · Mar 15, 2022

Its really a snatch block.when set up properly it doubles the capacity while using twice as much
cable making the winch work half as hard.the end of the winch cable must be attached close to
the winch to work.or with a boom right next to the last sheave on the boom
This container has living quarters built in and has a couple I-beams welded on as skids

Texasmark · Mar 15, 2022

A pipeline company just finished laying a 12 diameter fuel transfer line through my property. The wall thickness of the part laid from the surface is 3/8. The wall thickness on the part that that they bored under some rough terrain is 1/2. Point here is that you might look around for pipeline associated potential sources for a roller. Like your idea.

rrman61 · Mar 15, 2022

What did you use for bearings/bushings?does it want to bend /bind in the middle of the pipe under load?

Pete in MD · Mar 15, 2022

To double the theoretical pull the snatch block must be attached to the vehicle being pulled.
The cable then runs from the winch, through the snatch block, and back to a point near the winch.

MJMJ · Mar 15, 2022

I'm having a hard time understanding how a single block can ever double the advantage. I was taught all a single block can do is change direction of pull.

You are right, a single FIXED pulley only changes direction. But in this case it's a single moveable pulley, which in theory doubles capacity.

DoubleO7 · Mar 15, 2022

One pulley on the resistance/object to be moved and effort being the winch, the anchor end can be near the winch or off to the side.
But angle between the two cable runs will decrease the mechanical advantage of 2:1 to nothing more than a redirect pull as FE is less and less.

Screen-Shot-2017-08-29-at-11.14.28-AM-1024x737.png.webp

john in la · Mar 15, 2022

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.

BarnyardEngineering · Mar 15, 2022

To maximize your pull, consider cutting your cable down to the bare minimum necessary to reach the back of the trailer and back to the front. With it fully stretched out there should be the minimum number of wraps required on the spool. This is all in the winch's manual. If you don't have the manual for your winch you can find it online or at least you can find manuals for other winches with similar specifications that will be "close enough."

caterpillar guy · Mar 15, 2022

with a pipe under each side it would slide a whole lot easier than a dead drag pull. with a double snatch block it would also pull easier than a single. My problem is the snatch blocks I see for sale in the places I can buy winches look awful cheaply made for the extra pulling they will have to take. remember the pins and anchor points will still have the same load on them to pull or lift the item being moved just the winch and cable will see the lesser load.

Electric winch question

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