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Post by Deleted on Sept 8, 2009 13:35:10 GMT
Can anyone shed any light on why line marked as '36 lb breaking strain' is also marked '12lb test' ? 
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Post by roughmac on Sept 8, 2009 16:12:15 GMT
Anything to do with Factor Of Safety ? x 3.
So tested to 12Ib which gives a FOS of 36Ib breaking strain
Things that are tested like this usally have a built in FOS of 2, 2.5 or 3 etc.
Martin
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Post by norfolkdick on Sept 8, 2009 20:43:03 GMT
Greetings,
You have not said what sort of line you are talking about but I suspect you are discussing Dyneema or spectra line. These lines whilst having a huge breaking strain for their diameter when tested on a line tester (that is the line is clamped between two soft clamps and tensioned to breaking point) they have a really bad knot strength even with a very sophisticated knot, the knot strength of these lines is as little as 30% of the linear test.
This does not affect kite flyers very much at all because they usually sleeve the line with a length of hollow braided dacron so the pressure of the knot is dacron onto dacron and the dyneema is not in contact with itself. When it is the line fails through friction melting.
Sleeving is not an option open to the angler, a section of the market that uses tens of thousands of times more dyneema than kite flyers ever will.
Some manufacturers market their line by linear test and others by knot strength it is a huge mess when you are wondering why one line is over twice the diameter of another and is the same breaking strain!
Dacron maintains about 80% of it's strength when knotted and monofilament about 70%.
Best Regards
Dick
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Post by Deleted on Sept 9, 2009 17:02:28 GMT
I was asked about this by another kiter at Capstone and was baffled enough to want to find the answer! Being a fisherman I have read the same on monofiliment but never once pondered what it actually meant!
His question actually was:
"I have acquired some line, think its fishing line but twisted fused line, it says its 30lb (13.6kg) but also on the reel it says 12lb (5.4kg) TEST. Can some one explain the difference?"
Your answers have been excellent! Thanks clever Dicky![/b][/color]
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