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Search took 0.00 seconds. Search: Posts Made By: jfranta
Forum: Deck hardware: Rigging, Sails & Hoisting 11-03-2021, 08:38
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

DSM and Hampidjan say the color black, even in the polymer, does not have any effect on UV. DM20 has 25% more elasticity and does not heat stretch (more constructional elongation) well so we do not...
Forum: Deck hardware: Rigging, Sails & Hoisting 11-03-2021, 08:31
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

The chart is a linear regression of the data that we have from all over the world, including NZ,Australia, and Thailand. NZ has some of the worst UV exposure because of the hole over the south pole....
Forum: Deck hardware: Rigging, Sails & Hoisting 10-03-2021, 16:44
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

See attached chart on UV life of Dyneema for standing rigging on sailboats, 12 years of data, from 34 boats now, around the world. All naked Dyneema, fully inspectable. We are replacing line on...
Forum: Deck hardware: Rigging, Sails & Hoisting 04-01-2021, 09:09
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

Most of the pull testing we have done for our longevity testing the line breaks in the middle away from splicing. If the splicing was done correctly. Based on your other posts this is UV damage and...
Forum: Deck hardware: Rigging, Sails & Hoisting 04-01-2021, 09:00
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

If your backstay is 11 mm 1 x 19 we would use 13 mm Dynice Dux for it. This is equivalent stretch to the 11mm 1 x 19. It also gives you, 79200 kgs of breaking strength. After 10 years in tropics...
Forum: Deck hardware: Rigging, Sails & Hoisting 04-01-2021, 08:16
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

It was not our rigging but Heat stretched Dyneema from another supplier. It was undersized and increasing the size for the stretch that was needed solved the issue. John Franta, Colligo Marine.
Forum: Deck hardware: Rigging, Sails & Hoisting 03-01-2021, 12:51
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

Any supporting data? We know of internal damage in a dynamic sheave system with high loaded shrouds that were undersized so too much elasticity but never any internal damage from harmonics in...
Forum: Deck hardware: Rigging, Sails & Hoisting 03-01-2021, 11:26
Replies: 62
Views: 19,296
Posted By jfranta
Re: Another dyneema line failure

For Dyneema line, there mare many different variations of Dyneema Chemistry sk60, sk75, sk78, sk90, sk99, DM20, etc., then there are many different variations of braiding geometry, last there are...
Showing results 1 to 8 of 8

 
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