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Craig

Soft link failure

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A jumper today had a line over and cutaway uneventfully. When the main was back in the hangar it was found that a soft link had failed. These were NOT PD S-links just FYI. Phreezone (no, it was not his cutaway) might have a little more to add above what I know.

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Ok a bit more info on this after looking it over. The soft link that failed was a home made soft link out of Dacron. It was sewed into place and was not removeable unlike the PD's. This one was this riggers version of a softlink. It was lasted for many years and at least 150 jumps that I'm aware of. The Dacron appeared to fail where the riser and the link met. I'm not sure what side it was on but it was a wear spot and not a line spot. The PD links have stitching at these spots so wear is slowed and its easy to spot becasue the sewing will fray out before the cord will.

The soft link was poorly desiged in my opinion and required the use of a finger trap to hold them together in addition to the stiching. The PD's are a MUCH better design and I advocate those highly.

My guess is the friction from the riser was enough to wear through the dacron slowly and once the wear reached a certain point it casued failure of the material and there for the link. This failure was discovered on a jump that first started as a line over that the jumper was trying to clear on what is to me a hard opening canopy (SharpChuter). After flying for a few seconds the jumper poped the breaks and at this point it failed.
Yesterday is history
And tomorrow is a mystery

Parachutemanuals.com

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Alright, how much does a set of PD Slinks cost and how hard is it to install? Not much and very easy. How much time did the rigger spend trying to reinvent the wheel and ended up causing a malfunction with the reinvented wheel? Too much.

I'm all about saving money by doing stuff my self (read: working on my truck, etc), but wouldn't you think there is a line that could be crossed here?
--"When I die, may I be surrounded by scattered chrome and burning gasoline."

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Dave,

That is NOT a case of reinventing the wheel. You are showing your youth in the sport. rigger-made soft links have been around a lot longer than PD's SofLinks. They do tend to vary in quality as Phree implied in his post, but on the whole are not necessarily inferior to the PD product.

Faster horses, younger women, older whiskey, more money.

Why do they call it "Tourist Season" if we can't shoot them?

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Exactly Jack. These softlinks had been installed well before PD had ever marketed theirs. The original softlinks were not removable and more updated versions are reusable (bigg selling point). I've seen some designs for some nonreusable soft links that I think are equal to or better then the PD design but since every time you want to change risers, lines etc... it would involve making new ones and a lot of sewing. I'd perfer the reusability of the PD's.

And besides... Dacron is about $3 a yard... and a bored rigger can make for a dangerous combo ;)
Yesterday is history
And tomorrow is a mystery

Parachutemanuals.com

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Ooo when I saw this thread originally I was thinking it was a Slink failure at first and was rather taken aback.

My slinks keep misaligning. I know they are extremely durable... but how bad can they get when during deployment they rotate around? It happens on almost every deployment... and I've been resetting them every single time on packing. Does it make any difference?

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I'm RICK JAMES! Fo shizzle.

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I have a couple of customers that have had soft links for probably 10 years now. I know one has had the same set for about 5 years. I keep inspecting them and so far they're still holding up. 1000 lb dacron. The lines seem to be taking more wear than the link (500 microline). I was not convinced so I never tried to intall any home made one myself. Commercial removable ones now make them independent of the rigger skill and design.
I'm old for my age.
Terry Urban
D-8631
FAA DPRE

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My experience: Hand tacking through the SLink
doesnt work as well as hand tacking the riser
edges together. This allows the tab to freefloat,
but still stay trapped. I have mine tacked
so I -CAN- get it out (with a little work).

I also have Precision's soft links, with the ring.
this is kind of nice, as you can put one tack
through the ring, allowing it to freefloat.
I still like SLinks better though.

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Quote

My slinks keep misaligning. I know they are extremely durable... but how bad can they get when during deployment they rotate around? It happens on almost every deployment... and I've been resetting them every single time on packing. Does it make any difference?



Back when I had the softlinks with the metal ring I had that problem on every jump. When I first installed them I tried to make them take a set in the stowed position, and every time I packed I would have to push them back. Finally I got to the point where I just gave up...

Now I'm using PD-slinks, which haven't rotated out at all yet. I think it has to do with the way the PD slinks are made, I like them much better for this reason, and they are easier to install, IMO.

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Hook high, flare on time

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