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Loop Knots, which is better ?

January 30th, 2010

We use a lot of knots in fishing and particularly in carp fishing. One of the most often used knots is that used to create a loop. Whether it is to create a loop on the hair or in your mainline to create a loop for your leadcore we tie a lot of loops. In recent conversation with anglers I realised that many people use the overhand loop knot to create their loops, something that I also used to do. A few years ago I was shown the figure of 8 loop knot and I have found it to be far stronger and so it amazes me that some people still use the overhand loop.

In the words of Harry Hill,

“I like over hand loop knots, I like figure of 8 knots, but which is better ? There is only one way to find out….. Fight !”

I have therefore decided to run a fair and independent test to compare the 2 knots and finally put to bed the notion that the overhand loop knot has any use as a load bearing knot.

First lets look at the knots themselves and how they are tied

Figure of 8 loop

first make a loop ( note that I am using fluorescent string to make it easier to see what I am doing)

Pass it around and under its self

Take the loop formed and twist it one turn as in the next picture

then take the end of the loop and pass it through the other loop you just made lake so :

Note that now it resembles a number “8”, if your knot does not resemble a figure “8”¬† then you have tied it wrongly.

Overhand loop Knot

This one is easier ( which is why people use it) and can be best demonstrated by

Note that it is just a loop that has had an overhand knot tied in it. It is quick simple and does indeed form a loop – but is it significantly weaker than a figure of 8 loop ?

Test scenario

In the absence of a strain gauge I will just test the knots out against each other. I have done this by taking a piece of representative mainline ( 17lb Shimano Technium) about 30 cm long and I have formed 2 loop knots in each end. I have then taken each piece of nylon and have used 2 knot tensioners through  the loops and have pulled for a break. So as to ensure a fair test I have made sure that the knots alternate position each test, ie the over hand loop knot alternates from the left hand side to the right hand side.

As you can see it is a very simple test, you just pull till one side breaks and record which one it was. Simple and effective.

Test Results

Each of the lengths of Technium was pulled as above till the line broke, the results of the tests are shown in this table.

Test Number Knot that broke 1st
Test 1 overhand loop
Test 2 overhand loop
Test 3 overhand loop
Test 4 overhand loop
Test 5 overhand loop
Test 6 overhand loop
Test 7 Figure of 8
Test 8 overhand loop
Test 9 overhand loop
Test 10 overhand loop

OK something went wrong on test 7 but you can see that in all of the rest of the cases the figure of 8 knot won each and every time. On examining the breaks you could see that when the overhand loop knot broke it always broke either as the knot slipped or exactly at the knot. This indicates to me that the exit angle of the mainline through an overhand loop knot is putting undue tension on the line.

Summary

As is very clear from the above if you are using loop knots at the end of your hook link or look knots to join your leader to your mainline always use a figure of 8 knot and never use an overhand loop. It might take 1/2 a second longer to tie but it is far far safer and is a better knot that will not let you down.

Do you have comments ? do you have another opinion ? if so I would love to hear from you. If you look to the bottom of this page you will see a comments box. I will reply to all the comments posted and I welcome your input. Also if you would like to see articles on other knots or other topics let me know and I will do my best to create them.

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  1. paul spencer
    August 24th, 2010 at 23:35 | #1

    hi just wondered if you get the same results if you use a double overhand loop not? i’ve tested on 15lbs line and every time so far the line has gone before either of the knots when using an double overhand and a fig 8 is it just me thats getting this result or have you found the same? many thanks paul

  2. August 24th, 2010 at 23:39 | #2

    Hi Paul, I had not tried a double over hand loop, I suspect that it will be the same result as the overhand loop causes a strangulation and so a double loop will not increase the strength at all and the knot will break at the same place. Note that the overhand loop is not slipping ( which is where a double know would help) but is snapping on the start of the knot.

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