Thursday, May 31, 2012 at 23:06
Snatch straps are one of the most dangerous things ever invented, and must be used with exceptional care.
As an ex-contractor who learnt to drive heavy equipment in the days of Steel Wire Rope, we were taught early, the extreme danger of the vast amount of energy stored in a SWR under heavy tension.
When a SWR snaps, the damage it can do is unbelievable. A snatch strap stores more energy than a SWR because it stretches even more than a length of SWR.
There have been two fatal accidents in W.A. within the last 5 years involving snatch straps - and in both cases, the snatch strap didn't break - it was the items the strap was attached to, that broke.
The first involved a farmer SE of Wickepin, W.A. The
young farmer got a 4WD bogged, and went back to the house to fetch his wife and a second 4WD. The two vehicles were joined by the snatch strap.
The
young farmer drove the bogged 4WD, and his wife drove the second 4WD that was doing the towing. He instructed his wife to back up and "gun it", to use the inherent stored energy in the snatch strap, to "pop" the bogged 4WD out.
The wife did as instructed, and as the snatch strap reached its maximum tension, the bolts holding the towbar to the wifes 4WD broke, and the energy stored in the snatch strap, hurled the towbar through the windscreen of the bogged 4WD, hitting the
young farmer in the head, and killing him instantly.
In the second case, a bogged 4WD on a beach near
Geraldton was being debogged by using a snatch strap. The snatch strap was thrown over the tow ball of the towing vehicle. A woman passenger was left sitting in the front passenger
seat of the bogged 4WD.
The towing vehicle was backed up and gunned, and once again, as maximum snatch strap stretch was reached, the tow ball snapped, and it was flung back through the windscreen of the bogged 4WD, striking the woman passenger in the throat and causing fatal injuries.
There have been multiple events of this type, and many did not cause major injury - and possibly more similar events weren't even reported.
However, time and time again, the reports come in, that when using snatch straps to debog a vehicle - that the snatch strap hasn't failed - but the attachment points have.
As result, it's imperative that attachment points for snatch straps (each end) are secure enough to withstand a force, that is capable of stopping the towing vehicle in its tracks, at the maximum speed encountered when "
gunning it".
There is much talk on 4WD forums about methods of damping the energy released when a snatch strap is released from it's attachment point.
There's little discussion about how that release can be accompanied by a very large piece of metal on the end of the snatch strap, that isn't going to be damped by anything placed over a snatch strap.
By all means use snatch straps - but be very aware of the strength of attachment points - and be very aware of the amount of energy capable of being stored in a snatch strap, that is being taken to its full stretch, by 2-1/2 or 3 tonnes of fast-moving 4WD.
http://au.news.yahoo.com/thewest/lifestyle/a/-/lifestyle/10126780/towing-death-highlights-danger/
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