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how do you stretch HM line?

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MN3
 MN3
(@MN3)
Posts: 7090
One Star Admiral
Topic starter
 

Looking for info, methods, etc on how to best "pre" strech dynema to reduce lifetime streching (not creep)

I know Sam posted some data on it, but my searches have 't found it.

thanks!

MN3

 
Posted : August 9, 2019 5:54 am
Peter knapp
(@pknapp66)
Posts: 686
Chief
 

Like this of course 😀

https://www.youtube.com/watch?v=LR7HcsDY3kQ

H18m
p16
Venture15

 
Posted : August 9, 2019 6:23 am
MN3
 MN3
(@MN3)
Posts: 7090
One Star Admiral
Topic starter
 

Thanks Pete:
He looks like a real pro!

I love this comment: "What I've learned watching your video's is that boating isn't for me. Thanks for saving me a fortune!"

I probably wont be doing this method

MN3

 
Posted : August 9, 2019 6:29 am
Mike Krantz
(@mikekrantz)
Posts: 99
Mate
 

After I splice the line, I use a hydraulic ram and a load cell to run it up to 50% of it's breaking strength and hold it there for 30 mins or so. That resets the fibers that are loosened up during the splicing process.

The pre-stretched dyneema that I purchase has been run through a heat/steam die process to reduce the diameter and align the fibers. This is how all of the "pre-stretched" dyneema that I use is created.

-Mike

 
Posted : August 9, 2019 9:08 am
MN3
 MN3
(@MN3)
Posts: 7090
One Star Admiral
Topic starter
 

Thanks Mike,
can i borrow your ram?

MN3

 
Posted : August 9, 2019 9:21 am
Mike Krantz
(@mikekrantz)
Posts: 99
Mate
 

You're going to need a big truck. It's attached to a 30' I-beam.

If I can figure out how to edit a video clip, I'll post one of finding out what the breaking point is on a soft shackle

it's more fun to break stuff than just stretching things.

 
Posted : August 9, 2019 11:29 am
(@cholley12)
Posts: 148
Mate
 

I stretch it between my truck and wife's car tow points using my main sheet system. I'm figuring that I can put near 1k lbs into it. On smaller applications under 10 ft and under 1/8 line I stretch it on my bow string jig

 
Posted : August 10, 2019 3:05 am