Snatch Strap Comparo in 4wd Action Magazine #128

Crikeymike

Adventurer
I get it every now and then, but haven't seen that issue yet. There's a clip on their youtube account that shows a couple of straps breaking, that must have been from their testing article. Unfortunately there wasn't any info about them or who won. I'd like to see it though.

If I do, I'll see if I can scan the article, or is that not allowed to be posted?
 

chuck45

Observer
Wow! I'll be making even more certain everybody is away during a pull. I'd love to know the results of this test. I hope somebody posts the article or a link to it.
 

The Adam Blaster

Expedition Leader
Did they say how much force they were using when those straps blew apart?
I personally use straps with at least a rating of 18,000 pounds.
Maybe after years of repeated use and abuse, they would get a bit worn or frayed, and THEN I might be concerned about them failing, but I really can't see the average vehicle (Jeep, TLC, F/S Pickup or whatever) having enough force applied during an extraction to cause a new strap to fail like that.

Maybe some heavy-MMMMM fully expo-outfitted rig weighing 15,000+ pounds, but not the average 4wd vehicle out on the trail.
And if you had such a heavy machine, I would expect you would purchase an appropriately rated strap of 30,000 pounds or more. ;)
 
I use a 40mm 66,000 lb rated Marlow KERR 45' long. I wish it were 48mm (90,000 lb). Supposedly it's rated for vehicles 8-12,000kg. Sometimes I'm under 12, sometimes a bit over.
You can get stronger snatch ropes built of appropriately stretchy synthetic fibers at places that sell rigging like wire rope etc.
I guess the moral of the last part of the clip is that perhaps braided/spliced rope is better than stitched ends.

Charlie
 
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DaveInDenver

Middle Income Semi-Redneck
Does anyone get the Australian magazine 4wd Action? They have a snatch strap comparo in issue #128 and was wondering which strap was the winner.

http://www.4wdaction.com.au/current_issue/128/
I don't have #128 and hopefully someone down under can get it. I subscribed for a while and a couple of local bookstores used to get it, but the supplier had trouble getting it reliably and so no more. :-( Anyway, A4WDM did a lab test a while ago in August of 2003 and here's that run down. I remember ARB changed their snatch straps design after this (supplier issue as I recall), so between most of the brands not being available State-side and being several years old, probably no longer valid...

Winner:
Kaymar 8000kg

Second:
RUNNER-UP
Bushranger 8000kg

Highly Recommended:
Black Rat 8000kg
Mean Green 8000kg
Terrain Tamer 11,000kg
Megastrap 8000kg
Super Cheap Auto 8000kg

Recommended
Megastrap 11,000kg
Mean Green 10,000kg

Not Recommended:
Terrain Tamer 8000kg
Ox 8000kg
Repco Mortorguard 7500kg
Megastrap 9500kg
ARB 8000kg
ARB 11,000kg
Super Cheap Auto 9000kg
 

DaveInDenver

Middle Income Semi-Redneck
You can get stronger snatch ropes built of appropriately stretchy synthetic fibers at places that sell rigging like wire rope etc.
Just a word of warning if someone who is not Charlie Aarons or another equally smart dude reads this, rigging slings are NOT appropriate for snatch use. They are designed to lift or retain cargo and are carefully designed not to stretch at all. So rigging webs are not the same as snatch straps. Places that supply rigging probably can supply snatch straps, but make sure to get the right thing.
I guess the moral of the last part of the clip is that perhaps braided/spliced rope is better than stitched ends.
I dunno if I would flatly say that only because a braided rope also requires proper technique to achieve the strength. I guess it all comes down to trust in the person doing the work, be that braiding (if it wasn't you), sewing the sling or whatever. I would also expect that a sewn sling would remain consistent over time since a spliced rope needs to be checked that it does not have internal rupture at the braids and has not loosened or started to slide with use or temperature and moisture changes. I personally feel it's easier to assess the condition of a sewn strap and that's an advantage.

Heck, even a braided rope requires that you trust the material strength of the rope itself, so I suppose you have to decide who you trust, what the true working margin is, etc. Even the ARB straps in the A4WDM test failed close to their rated strength (about 7000 kg) and so under normal use it's unlikely they'd fail any more often than one that meets its ratings. I mean, if you are trusting a 8000 kg strap to work repeatably and consistently at or greater than 6,800kg/~15,000 lbs, then I think you are risking significant failure of any strap due to age, regular manufacturing variance, etc. So if you have a 5,600kg/~12,000 lbs or more truck, I would not feel safe using a 8000 kg strap normally anyway (which is 70% of rated max as working). Not to mention ARB looked into the problem and changed their process, so in that sense I would trust them.
 

chuck45

Observer
I'd also like to know the mechanics of how the test was done. I run downhole tools in oil and gas wells. Some of my tools have shear sleaves or pins and I can often manipulate how they shear by how I apply the force. If I have a 40,000 shear sleeve and I pull into it in 10,000 pound increments and hold it for several minutes between each pull it will often shear a bit early. If I make one straight pull it will usually shear substantially higher than it's rating. Now granted brass and steel shear pins and sleeves aren't rope or strap but surely the design of the test will influence the results. I'd be curious if the test duplicated our actual use in any measure.

And the answer is certainly not just getting a higher rated strap. If we want the ballistic effect to help us pull out a Jeep or Landy we don't want a strap that is rated so high that it would take vehicles three times our weight to cause any stretch.

My chosen solution is the MasterPull Super Yanker 7'8" rope rated at 28,500 pounds. It use seems strong enough and it seems to stretch a lot better than the straps I have used in the past.
 
Just a word of warning if someone who is not Charlie Aarons or another equally smart dude reads this, rigging slings are NOT appropriate for snatch use. .

Well, thanks for the compliment, if that's what it is.
I don't think I suggested rigging slings. A rigging shop sells wire and fiber ropes, hardware such as hooks, shackles, etc etc. Made by reputable North American or European mfgs, for industrial/commercial use.
Reading www.samsonrope.com could be very useful. One will note that among the many choices of fiber ropes there are the very stretchy and very strong, but the two don't overlap. Clearly stretchy is good for a snatch application but it must be strong enough for a high safety factor (multiples of vehicle weight).
I think I would trust the people at at least my local rigging shop infinitely more than the salesman at a 4WD shop or an online 4WD sales outlet.

Charlie
 

DaveInDenver

Middle Income Semi-Redneck
I don't think I suggested rigging slings. A rigging shop sells wire and fiber ropes, hardware such as hooks, shackles, etc etc. Made by reputable North American or European mfgs, for industrial/commercial use.
No you didn't, sorry if my reply insinuated that you did. But reading it I thought the phrasing might confuse someone that rigging slings = snatch straps (since they are all nylon with loops and look similar) and I felt clarification might be useful. You can use rigging slings for tow straps I suppose, but as a snatch strap it would be not good. And yes, it was completely intended as a complement, I learn a lot reading your posts.
 
Speaking of safety factors, what do you all think is a good safety factor (ratio of breaking strength to vehicle weight) for a snatch strap?

Charlie
 

oldmungral

New member
testing straps

some of the tests are simply fixed at one end and pressure increased till max load
we are waiting on several tests mainly to do with jerking loads on our 2mt 8mt and 15mt straps
i will let you know the results as soon as i get them in feb
 

roscoFJ73

Adventurer
The results from issue 128.
The tests were done st the National Association of Testing Authorities using equipment designed for the task and the ones that are recommended ,are the ones that exceeded the manufactures rating by 10%.
The straps were tested for the full length including the eyelet.
There was no shock testing
Various load rated straps were tested.
All loads in Kg
The ARB 8000,11000 and 15000 exceeded their rated load by 13.4% ,11.2% and 20.9% respectively.
These were the best of the lot

The Tmax 8000 exceeded its load by 10.8%

4x4 Equipment 10000 by 10%(its 8000 was under par by -3.1%)

Just Straps 8100 by 14.4% and their 8550 by 10.8%

Terrain Tamer 8000 by 13.4%(it's other 2 straps failed dismally by -14.7% and -2.5%)

The lesson is that not all brands ,except ARB ,could achieve good standards in all their straps

There were some others like Bushranger 11000 that was just under at 8.4% and Nobles 8000 at 5.4%
Terrain Tamer 11000 was the worst at -14.7%
 

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