| | Understanding the Snatch Block! |  |
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+3RIDERED The Big Show Mud-and-Guts 7 posters |
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Mud-and-Guts
Admin
Posts : 5943
Join date : 2009-07-15
Age : 45
Location : Celina, Tennessee
|  Subject: Understanding the Snatch Block! Wed Jan 19, 2011 2:16 am | |
| A snatch block is a commonly miss understood tool that can be a big help when stuck in a deep mud hole or when you are trying to make due with an under powered winch. A snatch block can also be used to change the direction of which the winch will pull when there is nothing directly in front of your bike (or the direction you need to pull).
A common miss conception with a snatch block is that it will double your pulling power which is close but not exactly true. In the following When I say load I am referring to the amount of force in pounds that is required to move the object being pulled (bike).
When using one snatch block correctly you can use the equation:
1.1 x load / 2=force required from the winch.
To find the total force required from the winch you must first take the total load required to move your bike and multiply it by 1.1 to calculate for the friction added by the rope passing through the snatch block. For example a 1000lbs load pulled through a snatch block becomes an 1100lbs load due to the added friction which is calculated by using the following equation 1000x1.1=1100. By attaching the snatch block to a tree then running the winch cable through the snatch block and back to the load will create two things a slower rate of pull and less load on the winch. Now you have two points of attachment to the bike which will equally divide the total load by two. When using a single snatch block the original 1000lbs load multiplied by 1.1 and divided by 2 parts now requires 550lbs of force from the winch to be moved.
You might ask where did I get the 10%! Well it is the industry standard in the utility industry to calculate 10% for each pulley. 10% is not always exact due to the differences in pulleys and the size of the rope but it is a good base line figure.. | |
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The Big Show
Lite Mudder
Posts : 99
Join date : 2010-05-31
Age : 49
Location : Henderson Ky
| | Subject: Re: Understanding the Snatch Block! Wed Jan 19, 2011 6:42 am | |
| Thanks for sharing  | |
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RIDERED
Over the Top Mudder
Posts : 2056
Join date : 2010-05-20
Age : 42
Location : Livingston , TN
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Mud-and-Guts
Admin
Posts : 5943
Join date : 2009-07-15
Age : 45
Location : Celina, Tennessee
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Moto92
Extreme Mudder
Posts : 999
Join date : 2010-06-02
Age : 47
Location : Mt. Vernon, IL
| | Subject: Re: Understanding the Snatch Block! Wed Jan 19, 2011 8:36 pm | |
| theres too much math in that post.
lets just say snatch blocks are good to have in the tool box. | |
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Mud-and-Guts
Admin
Posts : 5943
Join date : 2009-07-15
Age : 45
Location : Celina, Tennessee
| | Subject: Re: Understanding the Snatch Block! Wed Jan 19, 2011 10:17 pm | |
| - Moto92 wrote:
- theres too much math in that post.
lets just say snatch blocks are good to have in the tool box. I know I wrote it and it confused me! lol We had rigging in school and I found it interesting because of how much we could use offroading... | |
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Moto92
Extreme Mudder
Posts : 999
Join date : 2010-06-02
Age : 47
Location : Mt. Vernon, IL
| | Subject: Re: Understanding the Snatch Block! Wed Jan 19, 2011 10:33 pm | |
| just make sure to clean off your block when done. you never want to go back home with a dirty snatch  | |
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Rincon Jed
Lite Mudder
Posts : 61
Join date : 2010-07-20
Age : 49
Location : Rushville, IN
| | Subject: Re: Understanding the Snatch Block! Thu Jan 20, 2011 12:13 am | |
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wvyankee2
Lite Mudder
Posts : 70
Join date : 2010-08-12
Location : West Virginia
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Mud-and-Guts
Admin
Posts : 5943
Join date : 2009-07-15
Age : 45
Location : Celina, Tennessee
| | Subject: Re: Understanding the Snatch Block! Sun Nov 13, 2011 8:25 pm | |
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baronthered
Lite Mudder
Posts : 39
Join date : 2011-02-25
| | Subject: Re: Understanding the Snatch Block! Thu Nov 17, 2011 3:41 pm | |
| There could be a lot more math involved if you start counting how deep you're stuck and in what. Adding an incline to the mix and a few of the other variables like just the weight of the machine as it sits and it's very easy to find out the winch you have is very badly undersized.
Different types of mud have different "gripping" properties and so do different kinds of sand.
Tire width and height.
Add another ten percent for every turn around a block as well.
Some times combinations of these things can add (and multiply) up to more a 100% greater load than just the machine weighs.
and it goes on and on...
Not trying to be a buzzkill. If anyone is interested I can dig out my formula sheet and try and post it.
It's not as big a deal for say a quad or alight SXS but as vehicle weight increases the numbers get bigger very fast.
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Mud-and-Guts
Admin
Posts : 5943
Join date : 2009-07-15
Age : 45
Location : Celina, Tennessee
| | Subject: Re: Understanding the Snatch Block! Thu Nov 17, 2011 4:23 pm | |
| - baronthered wrote:
- There could be a lot more math involved if you start counting how deep you're stuck and in what. Adding an incline to the mix and a few of the other variables like just the weight of the machine as it sits and it's very easy to find out the winch you have is very badly undersized.
Different types of mud have different "gripping" properties and so do different kinds of sand.
Tire width and height.
Add another ten percent for every turn around a block as well.
Some times combinations of these things can add (and multiply) up to more a 100% greater load than just the machine weighs.
and it goes on and on...
Not trying to be a buzzkill. If anyone is interested I can dig out my formula sheet and try and post it.
It's not as big a deal for say a quad or alight SXS but as vehicle weight increases the numbers get bigger very fast.
So true brother! That's why I always recommend the biggest winch you can afford. Thanks for sharing! | |
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Moto92
Extreme Mudder
Posts : 999
Join date : 2010-06-02
Age : 47
Location : Mt. Vernon, IL
| | Subject: Re: Understanding the Snatch Block! Thu Nov 17, 2011 6:11 pm | |
| guess i should try using the block some time. i have two of them and have never used them | |
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baronthered
Lite Mudder
Posts : 39
Join date : 2011-02-25
| | Subject: Re: Understanding the Snatch Block! Fri Nov 18, 2011 6:31 am | |
| [/quote]So true brother! That's why I always recommend the biggest winch you can afford. Thanks for sharing! [/quote] Glad someone enjoyed it.  I'll look for the formula sheet/card I made a few years ago. It is kind of like a flow chart. Input vehicle weight and basically find the variables that match the situation, do the operations mathematically left to right and voila! a fair approximation of how much weight you will need to pull. Recovery starts from there. I just hope I didn't lose the files when this heap of electronics crashed. Gotta love redundancy! | |
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