yikes
NAXJA Forum User
- Location
- SE Wisconsin
Is an 18,000 lbs rated snatch block enough for my Cherokee ? I have a Warn M8000 - If I understand correctly, I should only "need" a snatch block with a 16,000 lbs rating. Is that right ?
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SCHOOL ME ON SNATCH BLOCKS
- Thread starter yikes
- Start date
dinorl007
NAXJA Forum User
- Location
- dublin, va
yes, iirc every time u put the cable through a block and to a different anchor point it doubles the strength maybe someone else that knows for sure will chime in, but i believe that is correct, the formula i have always used anyway
WTF
NAXJA Forum User
- Location
- Raleigh, NC
yes it's adequate.
http://pirate4x4.com/tech/billavista/Recovery/index.html
i don't think snatch block calculations are in there, but plenty of other useful information
i don't think snatch block calculations are in there, but plenty of other useful information
fyrfytr1717
NAXJA Forum User
- Location
- Turlock, CA
Wow, an hour of reading later and I'm finally getting back to this thread.
Stihl029
NAXJA Forum User
- Location
- San Diego, CA
Pirate 4x4 is an awesome resource for mods and builds, I keep it handy. And that snatch block should be good.
ColoradoRaptor
Headbanging Hillbilly
- Location
- Canon City, Crawlorado
Your kidding.....right!! 18000lb rating would support THREE XJ's and some!!
yossarian19
NAXJA Forum User
- Location
- Grass Valley, CA
The issue is that with the forces involved in a pully system + the fact that the XJ might be wedged into a rocky creek bed... you could easily exceed the vehicle's weight in effective load
- Location
- Hammertown, USA
I read that. I wasn't thinking about winches.
Or rather, recovery gear.
:scottm:
The way to figure out a load on a pulley mathetmatically is hard, but you can just eyeball it. Basically if the cables are parallel, that's 2 times the mechanical advantage. The further apart they get, the less mechnical advantage (And thusly less load on the snatch block) you have.
fyrfytr1717
NAXJA Forum User
- Location
- Turlock, CA
The question is not whether it would support an XJ, but rather whether it could handle the maximum force exerted on it by the winch. 18K should be fine for a 2:1 system (rope out, through the pulley, and anchored back to your vehicle) with an 8K winch.
yossarian19
NAXJA Forum User
- Location
- Grass Valley, CA
There is also the loss to friction in the pulley - I don't know what wire rope in a snatchblock does, exactly, but climbing rope through carabiners is about 30% loss if I recall. Figure with smoother line and bearing pulleys it might be 15% loss of pull.
_MURDERED OUT_
NAXJA Forum User
- Location
- Hernando, MS
I have 2 snatch blocks made by superwinch and they are rated for 22,000 LBS so it says on them...
Stihl029
NAXJA Forum User
- Location
- San Diego, CA
A snatch block has a pulley on a bearing to reduce the friction. In a pinch I have used large d rings. Just make sure that its really rated what it states and not a some chinese special. In addation it would not be a bad idea to run spectra of the same diameter as your wire rope. Here spectra is cheaper and can be made to any length requested with whatever terminations are required.