danielk
New member
That's some beautiful land!
Stuck, really stuck
- Thread starter KIBarrister
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aircommuter
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Then it’s not being used correctly. The block attached to the load of course.
you're right. The difference is if the winch is mounted to the same vehicle being pulled. If the winch is mounted on a different vehicle than the one you are pulling, the fixed/anchored snatch block just changes the pull direction.
orezok
Super Member
I was building a High School in Indio CA and the grading contractor set up his water tower in a bad location due to the availability of a fire hydrant. The soil around it was alluvial. Between the water splashing out of the water trucks and the constant leaking of the water tower the soil became quick sand.
A water truck got stuck and they sent a D8 to pull it out. The d8 sunk to its bottom plate and got stuck. They sent in a D9 to rescue the first one. It got stuck. A third 9 also got stuck.
It was quitting time so as I headed home, and the 8 and 2 9’s stuck to their frames.
I don’t know how they got them out, but they were gone in the morning.
On another occasion an operator who was cutting a road to a logging area got his D6? (Probably smaller) stuck in a mud hole. They brought in a larger cat to pull him out and he said they snapped a $10,000 rope/cable? Trying to get it unstuck.
The other operator told him, just wait a while and we will get you out.
Incomes a Sikorsky Sky crane. The cable him up and fly off with it.
That must have been a “cheap” rescue!
A water truck got stuck and they sent a D8 to pull it out. The d8 sunk to its bottom plate and got stuck. They sent in a D9 to rescue the first one. It got stuck. A third 9 also got stuck.
It was quitting time so as I headed home, and the 8 and 2 9’s stuck to their frames.
I don’t know how they got them out, but they were gone in the morning.
On another occasion an operator who was cutting a road to a logging area got his D6? (Probably smaller) stuck in a mud hole. They brought in a larger cat to pull him out and he said they snapped a $10,000 rope/cable? Trying to get it unstuck.
The other operator told him, just wait a while and we will get you out.
Incomes a Sikorsky Sky crane. The cable him up and fly off with it.
That must have been a “cheap” rescue!
aircommuter
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It’s simple to remember that the block must be in motion to double the pull minus friction of course.
CoyPatton
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There are times that a redirect is required. And there are those time that a redirect of the cable through a snatch block does not increase the pulling power of the winch and the snatch block is being used properly for one of its designed purposes.
If the winch is mounted on the vehicle you want to move, the snatch block could be attached to a deadman location (such as a tree) the cable doubled back to the stuck vehicle or nearby anchor point. Thus would increase the winch’s pulling power, but the snatch block would not move as the vehicle moved
There are many ways to use a snatch block, some will increase the pulling power of the winch and others will not.
Redirects are a proper usage design of a snatch block as is the usage to increase pulling power.
Google AI Overview
The theoretical reduction ratio (or mechanical advantage) of a pulley system is equal to the number of rope segments directly supporting the movable load assembly.
And:
roperescuetraining.com
Bruce
The theoretical reduction ratio (or mechanical advantage) of a pulley system is equal to the number of rope segments directly supporting the movable load assembly.
And:
Rope Rescue Calculating MA by Counting the Lines
Calculating the mechanical advantage using the
Bruce
MossRoad
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If the winch is mounted to the tractor, and the cable goes out to a pulley mounted on an immovable object, then back to the tractor, that's a 2:1 mechanical advantage.
MossRoad
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I don't think so.
- Winch mounted on a tractor, cable out to an immovable object is 1X mechanical advantage, or full pull.
- Winch mounted on a tractor, cable out to a snatch block that is fixed to an immovable object than back to the tractor is 2X mechanical advantage... twice the pulling power but half the speed.
The block does not move.
