Trent hink wrote: ↑
Sat Nov 02, 2019 5:59 pm
1/8" dyneema has a breaking strength of around 2500 lbs. so it should be adequate.
The extra diameter in unsheathed depower lines is to account for wear.
Every line we use in kiting is oversized mostly for wear, and sometimes for handling (not cutting you as easily).
When normal sized or over sized (300kg to 360kg) front lines get just a bit of wear or get some strands poking out at the splice, you need to replace those lines.
When undersized (less than 300kg) front lines get even extremely difficult to see wear, you may experience a wear break with no prior indication of that wear. So smaller lines that can handle the load brand new, have a shorter wear life, and may break without any warning.
Given that the PU tubing is there to prevent the wear on the depower line, smaller lines can be used safely for a given service life in a given environment.
Unsheathed lines are so big because the wear life in harsh conditions needs to be reasonable. And indicators like a completely broken strand of fibers is not detrimental, but rather an indicator that the safe use life of the lines is over and replacement is needed. So while your depower line may look pretty ratty, it is not going to give out on you immediately. If that same single strand of fibers was broken on a smaller diameter line, the reduction in capacity may be enough to cause unexpected breakage.