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Techniques Winching - Recoveries - Chainsaw Safety - Proper aproach to 4wding etc

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Old 22-12-19
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Default The use of winch rope/cable dampner brakes on snatch straps

For years the National 4wd Training Syllabus has required the use of a cable/winch brake when winching and snatching. These brakes are commonly called "air brakes" and there is a common misconception they act a bit like a parachute to slow down the cable, rope, strap and even a failed recovery point. Reality is they work best when they are weighted to 5-10kg but most people do not bother doing this.
Watch these videos and you may well change how you use an air brake or even start using one if you thought they were a waste of time.

https://m.youtube.com/watch?v=7STkTpTjDCU

https://m.youtube.com/watch?v=gPba-34ARZY

Safe Recoveries, OJ.
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Last edited by old Jack; 22-12-19 at 11:36 PM.
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Old 22-12-19
Jasonmc73 Jasonmc73 is offline
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Yes i've seen many people talk about these bags/ dampers etc.

I believe they give such a false sense of security, just toss one over the strap, not weighted & the nylon bags got you covered & we are all safe .

I like that young fella Seek Adventure & thats a great test at catching the rope with weighted damper in my opinion & it is logical.

Here is another view on the subject with damper catching a projectile.

https://www.youtube.com/watch?v=4sRebBY_muQ

Your life could very well be in a strangers hands that is pulling you/ snatching you out I believe.

I have no idea as i'm no expert so i'll leave it to the experts to give advice, but I know for me what I think, but I do see it as a very interesting topic, thanks for the links.

Last edited by Jasonmc73; 22-12-19 at 11:25 PM.
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Old 22-12-19
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Hi Jason,

Well the link you provided certainly puts the "dampner" on using an air brake on a snatch strap. The video clearly quantifies the incredible speed and the resulting deadly forces of when something goes wrong.

OJ.
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2011 PB Base White Auto, Smartbar, Cooper STMaxx LT235/85R-16,TPMS, HR TB, 3 x Bushskinz, front +40mm Dobinson , rear +50mm EHDVR Lovells, Dobinson MT struts and shockers, Peddars 5899 cone springs, Windcheater rack, GME UHF, Custom alloy drawer system inc. 30lt Engel & 2 x 30 AH LiFePo batteries + elec controls, Tailgate hi-lift/long struts, Phillips +100 LB & HB, Lightforce 20" single row driving beam LED lightbar, Scanguage II.
MM4x4 Auto Mate, Serial No 1 .
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Old 23-12-19
Jasonmc73 Jasonmc73 is offline
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Quote:
Originally Posted by old Jack View Post
Hi Jason,

Well the link you provided certainly puts the "dampner" on using an air brake on a snatch strap. The video clearly quantifies the incredible speed and the resulting deadly forces of when something goes wrong.

OJ.
I think this link is relevent to your post/ links, his info on use of dampner where & why he suggests & hopefully having the strap only as projectile.
In a Practical sense a clever young chap I reckon.

I've misused a snatch strap many time on the farm & my pig chasing days but i'm open to realise phew, for me personally that is!!

Old equipment more than anything, not smart

https://www.youtube.com/watch?v=kW304fXuG1M

Last edited by Jasonmc73; 23-12-19 at 12:37 AM.
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Old 28-12-19
disco stu disco stu is offline
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If pondered this for a long time. I always thought 2 would be better in case it's not perfectly in the middle and one end being longer reached the other vehicle.

The other part that I've pondered....the weakest spot of the cable would be the stitching area I thought, assuming no damage. I would then think that if the strap broke it wouldn't have anything to catch on the dampener and could slide through potentially meaning the dampener does nothing, although the end may well overtake the middle and then have to get pulled through the dampener. That one is a little harder to test without breaking the strap like the guy did on the vid with the tether, but I don't think he had a dampener in the video so we couldn't see how it went through the dampener
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Old 28-12-19
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The videos show the dampeners being torn to shreds by the recoiling snatch strap, this would indicate the strap is travelling though the dampener first at least a portion of the recoil. My take is dampeners work well when correctly used in a winching situation but do not work so well under severe snatch strap failures.

OJ.
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Old 28-12-19
Jasonmc73 Jasonmc73 is offline
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Quote:
Originally Posted by old Jack View Post
The videos show the dampeners being torn to shreds by the recoiling snatch strap, this would indicate the strap is travelling though the dampener first at least a portion of the recoil. My take is dampeners work well when correctly used in a winching situation but do not work so well under severe snatch strap failures.

OJ.
I could be wrong but my take as follows,

The video's posted by OJ would be indicative of a broken/ failed strap exactly what is suppose to happen as per design if anything happens, as the recovery point & all fittings/ shackles are strongest parts of the set up & in good condition, dampner weighted positioned to slow the re-coil of nylon/ snatch strap etc.
With 5kgish in that damper bag it would want to fall down if strap breaks & i'm sure strap would get caught up in it.
Although luck of the draw if it was a snatch strap not winch rope, i'm not so sure?

The stitching in snatch strap certainly will fail if overloaded/ stretched too far & is where I check for strap condition. I've done it snigging etc.

The video I posted is indicative of failed mounting/ poor recovery point choice or fittings etc & the strap has projectile/ D-shackle/ tow point as example still connected, tears the damper to shreads!

Point being outlined in the below link, make sure the strap is the weakest link or you run the real risk of death.
I'm not suggesting this isn't already common sense or anything, just outlining & posting the below for reference/ explanation of my opinion on useful use of dampner for me.

Note: Not advise an opinion, ask the experts for advise.

https://www.youtube.com/watch?v=kW304fXuG1M

Last edited by Jasonmc73; 28-12-19 at 12:12 PM.
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Old 28-12-19
erad erad is offline
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My take on this issue is that if you put a damper on the snatch strap, as soon as the strap takes up the slack, the damper is going to be flung into the air. One of the reasons for a damper is to stop the winch rope from flying through the air and decapitating someone. With a snatch strap, what is more likely is that a shackle (or perish the thought, a towball) will come flying one way or the other. I cannot see the damper doing any good unless by chance it happens to be in the trajectory of the flying object.
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Old 29-12-19
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Quote:
Originally Posted by old Jack View Post
The videos show the dampeners being torn to shreds by the recoiling snatch strap, this would indicate the strap is travelling though the dampener first at least a portion of the recoil. My take is dampeners work well when correctly used in a winching situation but do not work so well under severe snatch strap failures.

OJ.
I thought it was the projectile on the end that was doing the damage. I'll have to watch the show motion ones again.

I thought a more sturdy dampener would do more slowing also, lasting longer before disintegrating. All the ones I've seen have been pretty flimsy. Some decent strap rather than just plasticy canvas.

Winch without elastic cable seems a lot more forgiving in comparison to snatch strap
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