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PostPosted: Mon Nov 25, 2002 11:46 pm 
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Thanks for all the comments.

robertovillate, can you recall the style of snap shackle you were using on the boats?

Some are crap, others are better.

In the picture a few comments above you see the wichard 2673 model which is the larger shackle and then attached to that is the pin style snap shackle. I am aware that the pin style is crap for a heavy load and will probably not operate under heavy load. I have tested mine to about 500 lbs load, I would be happy with 1000 lbs test load. To generate 1000 lbs load my 175 lbs body would undergo 6G of acceleration from the waist area of my body and I would probably break my back anyway.

I have an X2 quick release chicken loop attached to my snap shackle. I like double safety reversion.

Also have a look at the three ringed release video here.

http://static.howstuffworks.com/mpeg/sk ... elease.mpg



<font size=-1>[ This Message was edited by: den140 on 2002-11-25 23:48 ]</font>


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PostPosted: Mon Nov 25, 2002 11:51 pm 
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Roberto : pic's on the way soon.
The three ring system is used to hold the main canopy onto the parachuter. It must hold tonnes of load as he opens the chute and yet must be easy to release (under full body weight) if he needs to discard the main chute. There have been many attempts at a release, but the three ring system is the adopted standard. It is visible, simple, has no problem with sand or water and can be reset in the water (I have done it a few times), there are other minor advantages, but I can't be bothered to list them. Anyway you'll see. For a 10th the price of a wichard and some hand sowing, give it a go.


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PostPosted: Tue Nov 26, 2002 12:04 am 
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the rings look good, but regarding the post about the wichard, the 2673 is loaded at only about 1 degree to the angle of the release, if it wasnt for the nicks on the lever arm you could release it with only the pressure of the spring, about 2 pounds, this is the safest snap shackle on the market.

if you haven't used this specific shackle please do not tar it with the same brush, we've tried releasing it under a four man load using two loops of sewing thread and it worked fine.


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PostPosted: Tue Nov 26, 2002 12:07 am 
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however if you have experience of this exact shackle , please say so.


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PostPosted: Tue Nov 26, 2002 12:22 am 
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SQ : you're right, a recent sailing article (can't remember from where) did a survey on shackles and only one passed the 'release under load test'...it was the wichard. All the othershad release loads that exceeded acceptable limits.

Add to this the fact that exposure to the elements, sand and salt water contaminates the pin mechanism increasing the release load still further. Bigger shackles open easier when new, but degrade more and eventually take more load to release.

If you need a shackle : use a Wichard.


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PostPosted: Tue Nov 26, 2002 12:32 am 
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I couldn't agree more with sq225917. If you haven't held, examined and self tested a PARTICULAR shackle you should qualify your comments.

A car is a car, yet is an Opel a Mercedes Benz?

The very fact that NSI use the Tylaska on some of their bars gives me some confidence. Having examined and tested the Tylaska I am willing to trust my life to it, with the pre stated backup of the X2 chicken loop release.

If they both fail..Well I'm having a VERY bad day. Such is life!

<font size=-1>[ This Message was edited by: den140 on 2002-11-26 00:35 ]</font>


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PostPosted: Tue Nov 26, 2002 12:33 am 
Guys,

Let's not get stuck in the mindset of thinking that shackles are the only solution. For example, have you seen Prolimit's new spreader bar with integrated safety release. Even better, have you seen OR's new "Punch-Out system". Go to the link below, download the PDF and see page 8.

Let's stay alive!

http://www.oceanrodeo.com/


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PostPosted: Tue Nov 26, 2002 1:14 am 
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Hi, have you look at my post about my bar setup?
It has a very good (borrowed from a paragliding towing system) pin & tube Quick release.
The best part is the simetrical nature of the release handle. It doesn't matter if the QR rotates. Its relative position is fixed.
It works under heavy load. (forces acts in similar way to the 3 ring system).
Try to look at the video. It shows the "spinning leash" part of the bar and then the QR in detail. I use a wichard as a secondary release and as the swivel of the spinning leash system.

The movie is large 9MB. You coud download it at:

http://homepage.mac.com/hernanhome/FileSharing1.html


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PostPosted: Tue Nov 26, 2002 5:56 am 
Speaking of the T-8 I recently came across a guy on the beach getting dragged in the sand and trying to pull the trigger on his Tylaska T-8. Unfortunately, the sand jammed the unit and he was unable to release. Luckily a few kiters notice the problem immediately came to his rescue. He was OK but had to remove the harness to escape the kite. I personally use the Ronstan but never experience sand jamming the unit. I'm beginning to think maybe QR is the way to go now I've seen the downside to snap shackle. The guy swears by the unit, it releases with a slight touch. Looked like a 2" bolt shaft with 1" knot balls at each end.

Jimbo(LA)


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PostPosted: Tue Nov 26, 2002 6:13 am 
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getting back to your original question I use a 1/4 inch brass nipple 1 inch long. thread on an appropriate size piece of vinal tubing on the one end and then slip the nipple through the shackle then thread on another piece of tubing on the other end and you are set. find the correct size tubing and it is a very tight fit. You will need to hold the pipe still in a vice to twist on the second end.
This works well. You can trigger it by just pushing back on one side or to be absolutly sure pull back on both sides with your fingers making a v [can be done without looking]. I started with a longer nipple but tripped accedently too often since using ythe one inch nipple only tripped accidently once.
I feel this is a safe system but still a good idea to use a qr chicken loop too.
Do you know a good loop that doesn't release accidently?


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