Asda, stuck HGV, and a scenario.

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slob said:
years ago we pulled a plane(trident or tristar) out of the mud at the end of belize airfield. had someything like a 45:1 pull and, if i remember correctly 4 AEC size trucks to pull the bugger out...the series landy wouldn't touch it

hardly surprising. a tristar weighs 100 metric tons empty and over 200 tons max.
 
But how do these strains relate to the strain of pulling a stranded fellow landy out of the mud on a pay&play etc? At the end of the day probably 30%+ of the people on here would hitch a stuck mate up and pull them out of mud upto the eyeballs (some of you may even snatch it out!). It's not like any of us are talking about pulling a truck for 20miles, were only talking about a pull to the verge or onto solid ground. & didn't the police originally justify buying Rangies with "we can pull a 44tonner off the mway in an emergency"? I even recall someone suggesting that was the excuse of the HA wombles driving Disco3's hundreds of miles to knowhere.

And finally relating to the original point - if the truck was leaving asda logic says it was probably empty (they tend to take stuff out and put it on the shop shelves) so didn't weigh a full 44T anyway.
 
But how do these strains relate to the strain of pulling a stranded fellow landy out of the mud on a pay&play etc? At the end of the day probably 30%+ of the people on here would hitch a stuck mate up and pull them out of mud upto the eyeballs (some of you may even snatch it out!). It's not like any of us are talking about pulling a truck for 20miles, were only talking about a pull to the verge or onto solid ground. & didn't the police originally justify buying Rangies with "we can pull a 44tonner off the mway in an emergency"? I even recall someone suggesting that was the excuse of the HA wombles driving Disco3's hundreds of miles to knowhere.

And finally relating to the original point - if the truck was leaving asda logic says it was probably empty (they tend to take stuff out and put it on the shop shelves) so didn't weigh a full 44T anyway.


:doh: :doh: :doh: ave you noticed the date on this thread?
 
just to add my bit the breaking strain on ropes straps etc is worked out for a dead lift as a safe working load probably about half the actual breaking point and anyway the clutch would most likely burn out first
 
just to add my bit the breaking strain on ropes straps etc is worked out for a dead lift as a safe working load probably about half the actual breaking point and anyway the clutch would most likely burn out first

7:1 factor of safety for lifting m8
 
Barring the fact that this post has been resurrected from 4 years ago, can we not all just accept that while an HGV could possibly weigh up to 44,000kg - you aren't trying to lift it in the air, just pull it along on it's wheels (if it's on ice the wheels will still roll, the limiting factor will be your grip - if you can't grip you won't be able to pull owt!) which will probably be no worse than pulling a trailer with a large car on it...
 
You'll lose grip before you rip the chassis in half, or the towbar off, unless its so corroded that it shouldn't be on the road anyway. If you're on the level and smooth surface, all you're doing is overcoming the rolling resistance of its 18 wheels or so, with your 4 wheels.

Being bogged down in mud is different, and depends on a lot of other factors such as - is the stuck car also spinning all 4 wheels (or is it broken down?) - is the chassis sitting on the mud too, meaning there will be a shear force to overcome - is there any slope involved, eg has the stuck car "dug itself down" or obstacles like tree roots, etc etc. Every off road recovery is slightly different.
 
You'll lose grip before you rip the chassis in half, or the towbar off, unless its so corroded that it shouldn't be on the road anyway. If you're on the level and smooth surface, all you're doing is overcoming the rolling resistance of its 18 wheels or so, with your 4 wheels.

Being bogged down in mud is different, and depends on a lot of other factors such as - is the stuck car also spinning all 4 wheels (or is it broken down?) - is the chassis sitting on the mud too, meaning there will be a shear force to overcome - is there any slope involved, eg has the stuck car "dug itself down" or obstacles like tree roots, etc etc. Every off road recovery is slightly different.

I was meaning in a general sense - eg. 44T rolling is equivalent to pulling a Landy in mud upto its hubs? arches? bonnet? roof? Obviously we can't calculate the exact effect of mud as every puddle of mud is different but I just wandered in a rough sense how bad a rolling load can be compared to a stuck one when we wouldn't pull a truck but would pull a landy.
Not that I'm saying I'd fancy pulling 44T on my Disco hitch.
 
Unless you saw it happen or have driven that particular piece of land, you simply couldn't tell how much force a "stuck" 4x4 needs to pull it out, in an off road situation. You'd be able to make a fairly accurate judgement on how much pull a 44t truck would need on tarmac, though. Another factor is traction - on tarmac pulling a lorry, you'll have plenty of traction so your transmission would be under more stress than in a typical off road situation, where you will probably spin wheels instead of breaking anything, if the stuck one is deeply bogged down. In reality, you'd not really risk breaking anything, but you'd be putting abnormal wear on the clutch, and might overheat it in the process of trying. If it were auto you may overheat the transmission fluid.
 
im must admit i av wanted to help a few people out now and again but as they avent had the correct tow rope or out, i havent helped them (i have a 4tone tow rope)

but after this post i dont think i will help them ...

but while we are on the topic of towin wat is the most ur disco could pull .... daft question but i would like to know ???
cheers anthony
 
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