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winching question ?

T

tourdog

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ok so heres the scene. this weekend i need to pull a school bus out of the bushes were it has been sitting for about 5 years sunk to the axles front and back . i have a 12000lb warn on the front of cucv. now for the question ? i have a three part block and tackle with 10,000lb rope in . to dead hook the b&t to some thing pull the free end with winch it will increase the pulling power . but will it take alot of strain off the rope as well . i know to snatch block will double but does that take strain off the cable . i guess i am asking if the rope will take it .i guess i am tring to say is will the rope and calble rating increase as well as pulling power .
 
The tension in the cable will never be higher than the maximum pull rating of the winch. Using a snatch block will double your pulling force, but the max tension stays the same (ignoring friction from the snatch block). So, your cable should be fine unless it is damaged.
 
Check this out!

http://coloradok5.com/forums/showthread.php?t=204295

I made a great post a while back dealing with this situation. Click on link above and read the post.
stuckexample.jpg


This might help you too.

As a general rule, the safe working capacity (SWC) of a rope can be obtained by squaring the diameter of the rope in inches (SWC = d 2). This formula gives SWC in tons, allowing a safety factor of approximately four.

Example: SWC of a 1/2-inch rope is .5 x .5 =.25 tons (1/4 ton)

The strength of a chain is measured using the formula, SWC = 8d 2, where SWC = the safe working capacity in tons; d = the diameter of the chain stock in inches.

Example: SWC of a chain with a diameter of 1/2-inch is 8 x .5 x .5 = 2 tons.
 
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I believe he is saying that he has a block and tackle with it's own rope (think lifting hay in the barn) and he wants to know if he can use the winch to pull on the end of the rope you would pull on with your hands. The block and tackle sounds like it has a safe limit of 10,000lb. A 12k warn will outpull that already. What you want is a snatch block rated for use with a 12k winch.

http://www.warn.com/truck/accessories/snatch_blocks.shtml

I would not use the winch to pull on the B&T rope because it was designed for a person to pull on by hand and would most likely fail. We don't want to find out that you or anyone else got hurt in the process.
 
It's very doubtful that you will be pulling a school bus that has sank to the front and rear axles out with a truck and a 12K winch. Sounds like it's time for a tractor and some HEFTY chain. :deal:
 
winching

Metrodps has the idea of what i want to do dead hook the b&t pull it with winch .I have seen the sites you guys have posted look at them thanks great ideas. I also read a while back when Metrodps posted his info thats were i get al these crazy ideas from . well i am going to try . it will be fun lots of cooooold beeeer as well .
 
All i have to say is good luck. This has bad written all over it. Do you have any idea the amount of force it will take to move a vehicle that is sunk in mud to the axles? I see people break winch cables and winches all the time when they try a stupid thing as such. PLEASE, stay out of the way of all flying winch cable, rope, and tackle.
 
yes and no, if you use a block to 2x the winch then no, if the bock load is same as the winch then then the pull will be 1/2 ,+ 10%for the block if you chang direction.
 
Well, hopefully he will post pics of the damage that is sure to happen. Seen it too many times. Just last year i watch a friend in a K5 truggy get stuck in a mud hole with only his front axle and they broke 2 30K straps trying to get him out and then had to change direction as how to extract him.
 
4X4HIGH said:
Just last year i watch a friend in a K5 truggy get stuck in a mud hole with only his front axle and they broke 2 30K straps trying to get him out and then had to change direction as how to extract him.
Click to expand...

So lets see what it took for said vehicle.

Truggy weighs 5,000 pounds

[FONT=Arial, Arial, Helvetica][FONT=Arial, Arial, Helvetica]Stuck (mire) resistance:
[FONT=Arial, Arial, Helvetica]A pull of 200% of LW will be required if the truck is stuck to the hubs.[/FONT][/FONT][/FONT]

So that would be 15,000 pounds

[FONT=Arial, Arial, Helvetica][FONT=Arial, Arial, Helvetica]Surface resistance
[FONT=Arial, Arial, Helvetica]A pull of 1/3 LW will cause a free wheeling truck to move on a softer surface, such as grass or gravel,[/FONT][/FONT][/FONT]

So that would be 20,000 pounds

[FONT=Arial, Arial, Helvetica][FONT=Arial, Arial, Helvetica]Grade (slope) resistance:
[FONT=Arial, Arial, Helvetica]Upgrade (vehicle has to be recovered up a slope or grade) [/FONT][FONT=Arial, Arial, Helvetica]15 degrees - add 25% of LW
[/FONT][/FONT][/FONT]
So that would be 25,000 pounds

[FONT=Arial, Arial, Helvetica][FONT=Arial, Arial, Helvetica]Final figure:
[FONT=Arial, Arial, Helvetica]Add surface or damage or mire resistance and grade resistance, and this is your final figure or rolling resistance. This is the amount of pull the winch must apply in order to recover the stuck vehicle.[/FONT][FONT=Arial, Arial, Helvetica]
[/FONT][/FONT][/FONT]
If I understand it and did the math right (I sux at math) It should of taken almost 25,000 pounds force to free.

Sounds like he might of been more like 300% on the mire being he was axle deep
 
winching

well I will try to have pics of the whole operation . if things go good the only thing that might break is the b&t and rope not a big deal to me . I am not in to breaking any more than that getting this bus out is not that importain to any one. but really like all of the input .
 
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