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Garry, a tree protector strap should be rated higher than your winch cable load, esp. if you reeve one eye through the other or when using a snatch block, if you loop around a tree (not too great a diameter) instead of reeving (one eye through the other) it would be OK, Regards Frank.Quote:
Originally Posted by garrycol
bridle description-
as with all stuff on the net,, make your own mind up,,
Heavy Duty Equalizer Strap
I wasn't talking about winching - talking about snatching and using a tree protector strap as a bridle. Snatching loads can be twice as high as winching loads.Quote:
Originally Posted by Tank
Quote: "Snatching loads can be twice as high as winching loads."Quote:
Originally Posted by garrycol
I don't know how you come to that conclusion Garry as most snatch straps have a Breaking Strain (BS) of 8000kgs. Most winches advertise a BS of their winch cables at 9000kg BS to 12000kg BS.
Getting back to my point, that is, a tree protector strap should be rated at a higher BS than all of your other gear, it is the final piece of gear between your vehicle and a solid anchor point and if it fails a great deal of damage or injury would result.
The TOTAL load of a winching operation is transferred to the TTP strap.
So if the TTP strap is used as a Bridle strap it should have a BS higher than the Snatch strap and be long enough to minimise the angle at the top of the triangle formed by the bridle strap. I know you weren't talking about winching, but the TTP strap is part of the winching gear and it should be adequate for the job it is used on, regards Frank.
Im thinking that it would be rare for a recovery to be exactly straight ahead, with centered pull and for it to remain this way durring. I would have thought that a wire or synthetic rope, rated of coarse and a winch block pulley used so it will always share the load down each chassis rail. Unless your recovery line can move on the bridle it will be unequal at most times.....
Most snatch straps are rated in Kg (mine is 10,000kg) and winches are rated in pounds - most winches are 9000lbs to 12,000lbs not 9,000kg to 12,000kg hence my general comment that loads under snatching can be up to twice that of a similar winching exercise.Quote:
Originally Posted by Tank
I use a lifting type of sling, a roundsling with a core thats the rated material and the outer sheath that's protective. Fitted to each recovery point with a bow shackle, and another from the sling to the recovery line, which can slide across as required, since as stated the direction of pull can vary.
And before anyone starts, it was discussed & demonstrated in length with the suppliers about it's end use, what size to use (ended up being 3T and 2m) and best set up (as described above to achieve equalisation as best as possible). The included angle ends up being about 40deg for a 2m sling with points 600mm apart. So rating for the sling in this set up would be about 6t, with 7:1 safety factor. Best part is comparatively pretty cheap at < $50-.
Average Snatch strap = Breaking Strain (BS) of 8-10,000kgQuote:
Originally Posted by garrycol
ARB (this was easy to find) Tree Trunk protector - 12,000kg min BS
Loads on a snatch recovery can ONLY top out at the Breaking strain of the Snatch strap (in your case assuming its Bs is spot on 10,000kg) then something will give at 10,000kg...
A winch recovery can include Slip and Grip situations... Big shock loads..... Well over 10t