I seem to recall a recommendation in a thread somewhere here that the snatch strap should be rated between 2 & 3 times the weight of your vehicle.
I seem to recall a recommendation in a thread somewhere here that the snatch strap should be rated between 2 & 3 times the weight of your vehicle.
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Is this recommendation based around getting the required stretch of the strap to generate the recoil action? If so, I am then being led to believe a strap selected with a greater ratio won't give you the same sling shot effect on the basis it has a higher breaking strain and is stiffer/stronger - is this the principle? I am curious as i have just up-sized my 50mm straps of unknown vintage to 75mm / 1000kg breaking strain and wondering if I should have stayed with the 50mm versions - the 50mm units look so much smaller when side by side with the 75mm units. I don't have any idea what my barge weighs when loaded up but suspect close to 3 tonne at a guess, maybe heavier?
Pretty much, yeah.
Without getting into in a huge amount of science... the purpose of the strap is to transfer the energy of the momentum from one vehicle to the other in a controlled manner.
If the strap is too stiff the energy is transferred too quickly and then the moving vehicle decelerates with enough energy to smash the drivers teeth together with enough force to crack a wallnut and either the other vehicle launches out like a space shot or the strap or attachement breaks.
If the strap is too light then there may not be enough conserved energy applied before the strap reaches full extension and the moving vehicle looses traction and stops or again, the strap or attachement breaks.
If the strap is more than 3 times the weight then the former is more likely to occur and if the strap is less than 2 times then the latter applies.
The width of the strap is not 100% definitive as the manuf may use different material or thickness but would be a good guide I s'pose
Another point is that if you need to apply in excess of 9 tons of force to get a 3 ton vehicle moving that is sort of similar to trying to tow 9 tons of load (say, 1/2 a semi trailer with no wheels) with a 3 ton vehicle then some pretty average things are going to happen.
I usually dig out the bogged vehicle a reasonable amount and give it a try in low 2nd at about 1200 to 1500 RPM with 2 metres of strap laid down (1/2 a metre by a metre by 1/2 a metre in an S).
If that starts to work then you can go a bit harder or if it works then great, which it usually should.
If the stuck vehicle doesn't move then start digging some more.
Last edited by the evil twin; 22nd October 2016 at 12:41 PM.
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Bigcol (23rd October 2016), MB (24th October 2016), MudRunnerTD (25th October 2016), PeeBee (22nd October 2016)
I think of the snatch strap as a "fuse" in the recovery process. If all turns to poop I would rather break a strap than tear a piece of either vehicle. Bigger is definately not better.
The sort of questions you are asking Mc4by would suggest you may want to look at a 4WD training course or join a 4WD Club and get the training for free.
Mc4by (25th October 2016)
MudRunnerTD (25th October 2016)
http://cloud.tapatalk.com/s/580e21fa...nded%20pdf.pdf
Came across this pdf guide on juststraps site.
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