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August 03, 2007

Bimini Twist Break Anaylsis

Actual breaking strength test results

I consider the Bimini fundamental because it gives you a double line to work with. Clearly the strength of whatever knot you then tie increases considerably, thanks to two strands. Therefore, a great deal - often, everything - is riding on your Bimini twist. Past testing has shown that a well-tied Bimini should be just about as strong as the line itself for mono and may come close for braided lines. I wanted to see how true that is for all brands of line - and found some surprises.

Braids for which Biminis broke at more than 95 percent of the line's actual strength

? Cortland Spectron (104 percent)
? Berkley FireLine (99)
? PowerPro Superline (98)
? Western Filament TUF-Line (98)


Test Results



   
Brand Line

% of Actual Strength

Range of Actual Breaks

Standard Deviation

Monofilament Lines
Ande Premium  113
28.1 - 29.4
0.7
Pradco Silver Thread AN40 108
27.0 - 28.5
0.7
Sufix Elite 107
28.4 - 1.0
1.4
Hi-Seas Black Widow 104
21.1 - 21.9
0.4
Pradco Super Silver Thread 104
28.3 - 28.8
0.3
Yo-Zuri Hybrid (Fluoro/Mono) 104
32.2 - 23.3
0.1
Berkley Big Game 103
28.8 - 30.8
1.1
Berkley Big Game Hi-Test 103
30.6 - 32.5
1
Penn Premium 103
24.5 - 24.6
0.1
Shakespeare Cajun Red Lightnin' 103
23.0 - 23.2
0.1
izorline Platinum 102
31.8 - 32.5
0.4
Platypus Classic 102
23.7 - 26.0
1.2
Platypus Platinum 102
23.8 - 24.7
0.4
Bass Pro Shops Bass Pro Shops Excel 101
24.0 - 24.8
0.7
Platypus Pre-Test 101
21.7 - 22.0
0.2
Pradco Silver Thread Salt Water 101
27.7 - 28.5
0.4
Shakespeare Cajun Red Cast 101
23.7 - 25.6
1
Stren DuraTuf 101
31.7 - 32.0
0.2
Sufix Tritanium Plus 101
28.9 - 30.0
0.7
Berkley Big Game IGFA 100
18.4 - 18.8
0.2
Offshore Angler Tight Line 100
22.9 - 23.1
0.1
Triple Fish Fluorocarbon 100
20.4 - 21.9
0.8
Mustad Thor 99
26.8 - 28.3
0.7
Berkley Trilene XT 99
30.8 - 31.0
0.2
Penn Professional 99
30.7 - 31.2
0.2
Maxima IGFA Class Line 98
18.0 - 18.1
0.1
Hi-Seas Red Devil 98
24.5 - 30.6
3.4
izorline First String 98
31.5 - 31.8
0.2
Sufix Siege 98
29.2 - 31.2
0.7
Triple Fish Armor Tough 98
25.1 - 26.1
0.5
Triple Fish Ultra Viz Perlon 98
24.3 - 25.1
0.4
Pradco Silver Thread Excalibur 98
26.4 - 26.8
0.2
Platypus Super-100 98
16.9 - 20.7
2.2
Berkley Vanish Fluorocarbon 97
23.2 - 23.6
0.7
Berkley Vanish Transition  97
21.0 - 22.5
0.8
Cortland Endurance Super Premium 97
26.4 - 26.9
0.2
Maxima Crystal Ivory 97
21.3 - 22.5
0.7
Sufix Key Lime IGFA  97
20.6 - 20.9
0.2
Shakespeare Cajun Advantage 97
26.4 - 30.8
2.3
Triple Fish X-rated 96
21.5 - 21.9
0.2
Berkley Trilene XL 96
24.3 - 25.5
0.7
Hi-Seas Grand Slam 96
26.5 - 27.5
0.5
Hi-Seas White Lightning 96
20.0 - 21.0
0.5
SpiderWire Super Mono XXX 96
26.5 - 28.2
0.9
Triple Fish Camo-Escent (Perlon) 96
27.3 - 27.5
0.1
Triple Fish Rx Spinning 96
22.5 - 24.8
1.2
Berkley Big Game Supreme 95
29.3 - 37.8
4.9
izorline XXX Super Co-Polymer 95
28.0 - 33.4
2.8
Stren Original 95
24.6 - 27.2
1.3
Hi-Seas Quattro Plus 94
24.9 - 25.8
0.5
Stren High Impact 94
26.3 - 30.9
2.3
Stren Super Knot 94
25.6 - 25.7
0.2
Platypus Lo-Stretch 92
18.9 - 20.1
0.6
Pradco Silver Thread Fluorocarbon 92
22.9 - 23.6
0.7
Momoi Hi-Catch  88
30.6 - 32.7
1.1
       
Braided Lines
Cortland Spectron 104
33.9 - 36.3
1.2
Berkley FireLine (Crystal) 99
45.0 - 49.2
2.2
PowerPro Superline 98
34.3 - 36.1
0.9
Western Filament TUF-Line 98
24.8 - 28.3
1.8
Ande Braid 91
25.4 - 33.1
2.5
Berkley Big Game Braid 90
32.4 - 35.1
1.4
Platypus Super-Braid 89
32.2 - 34.5
1.2
Stren Sinking Braid 88
18.2 - 20.7
1.3
Triple Fish Bully Braid 88
40.8 - 45.4
2.5
Offshore Angler Magibraid 86
23.5 - 24.0
0.3
Shakespeare Ugly Braid 86
22.2 - 24.1
1.3
izorline Brutally Strong 84
20.0 - 24.6
2.3
SpiderWire Stealth 84
31.6 - 34.7
1.6
SpiderWire Ultracast 83
37.7 - 48.7
4.3
Daiwa Saltiga Surf  81
16.4 - 20.4
2.1
Western Filament  TUF-Line XP 81
15.6 - 18.6
1.5
Sufix Performance Braid 79
21.1 - 29.2
4.1
Stren Super Braid 72
22.3 - 26.3
1.4

 



Discussion
This is where I must quote The Who: I can't explain. For a number of monofilaments, it almost seemed as if somehow tying a Bimini twist had strengthened the line! The first time I saw a Bimini break at several pounds above the mean strength of the line - in Ande Premium - for example, I thought it had to be a mistake, an anomaly. But on the proverbial Bible stack, I can assure you that this happened repeatedly - not only over the five tests from knots I'd tied for this test, but subsequently. That is, still shaking my head, I quickly tied up another batch of identical Bimini twists in the Ande and tested these. The average was almost the same as the five I'd just tested. Then I did another round of three straight line-break tests to be sure I had that right. And there it was: The line alone was breaking consistently lower than the line-and-Bimini-knot sections. Ditto with several other brands.

If anyone has a reasonable explanation, I am, as they say, all ears. Meanwhile, the test did prove that a good Bimini twist should nearly always retain more than 90 percent of the monofilament's strength. And nearly half the monos offered 100 percent strength. (Recall that these are 12-turn knots; 20- or 25-turn Biminis would differ, though previous testing showed more turns to be weaker in most cases. Now, limited testing has shown a mere eight turns to be stronger still. Note also that in all but a few knots, standard deviation was very low - less than 1 percent - suggesting further that well-tied Biminis should be exceptionally reliable knots.


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