Is there any difference in the pressure that can be applied if you used both 8lb low diameter line of say 0.22 and 8lb regular diameter line of say 0.33, would you be able to exert the same amount of pressure on casting a method feeder with both lines or would the lower diameter line come under more pressure with the risk of snap offs or is 8lb line the same as 8lb line irrespective of diameter?
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 You will probably find (up to you to test it) that the regular line breaks at about two pounds more than the low diameter stuff. Additionally, there is more give in the regular line so it will probably stand up to the stresses of casting better.
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Thats not quite what i was hoping to hear to be honest. One of the reasons for my switching to low diameter line was to help with longer casts, lower diameter line should mean longer casts? at least thats what i thought... You say that regular 8lb may break upto 2lb higher than low diameter 8lb... does that mean regular 8lb will break closer to 10lb or low diameter 8lb will break closer to 6lb? Sorry but im confused now and have already lost a little confidence before ive even begun using it. The line i just purchased was XLNT Camo if that helps at all.
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It's up to you to test it. Daiwa Sensor tends to break about 2lbs higher than stated i.e. 8lbs breaks at 10lbs. Test your two lines. Fix the line to a beam and tie a bucket on the end. Load up the bucket until the line breaks then weigh the bucket. You may find your low diameter breaks below 8lbs. But there may be other advantages like less water resistance, longer casting or better bite registration.
With line just use it and see how you get on. All of us do this through trial and error and learn what best suits our needs. the lines I use might be unsuitable for what you want because our requiremnets are different.
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That makes more sense thankyou. I was using Daiwa sensor but felt it had no personality if you know what i mean, it just feels thick and strong, great for hauling out Carp in couloured water but thats all, at least thats how it feels to me. Ive struggles with bites on some waters (more clear waters) so chose to change to low diameter camo line and see if that can help. I will try and root out a bucket later and measure my batch of XLNT Camo and report back with the breaking strain, i will say in advance that the line does seem very low memory and very low diameter and also very stretchy... i love the look and feel of it but its not about looks, it has to perform equal to the Sensor but with better qualities.
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 Mark, how do you attach the line to the beam and bucket - overlapped windings?
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I have a wire hook at each end and do a Grinner knot to each. There has to be knots in the test and as long as the same knots are used the test should be comparative. It is important to avoid very weak knots. I get 4lb Sensor to break at 6-02 this way!
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 Fishing with low diameter line is no different to fishing with ordinary line but you must set your reel drag to 10% less than the actual breaking strain and not the stated one, tested as Mark says with the knots that you normally use. The one point you must always remember when fishing with low diameter line is that it has less stretch (considerably less in some lines) and therefore is more prone to breakage if subjected to sudden increases in tension.
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Paul, line strengths and diameters quoted by manufacturers need to be treated with caution. It's easy to test breaking strain with a spring balance, and I do that with all the lines I buy. Some makers exagerate line strength. It's a bit harder to test line diameter unless you've a micrometer. Here's some examples, with manufacturers dia and breaking strain followed by actual breaking strain (knotted, dry line): Drennan Super Spec - 0.27 mm, 8lb, actual breaking strain 9.4lbs (this line is standard nylon monofilament). The stress within the line at the breaking point is 75 kg per sq.mm Drennan Double strength - 0.22mm, 8lb, actual breaking strain is also 8lb (the line might be copolymer, so is more expensive). The stress in the line at the breaking point is 95 kg per sq mm. So this line is able to withstand a higher stress before it breaks . Remember that the tension in the line is not the same as the stress within the line - tension is the force pulling on the line, stress is the tension divided by cross sectional area. But we anglers tend to say we put pressure on the fish to keep it out of a snag. It'd be a bit pedantic to say we increased tension in the line ! I think what you may be getting at is that nylon monofilament is more stretchy than modern copolymer. So if a large fish suddenly accelerates down stream, a stretchy line gives the angler a bit of time to respond, and give line at just below the breaking point, compared with a low stretch co polymer. Among low diameter co polymer lines, I can recommend Drennan Double Strength. Daiwa TDR is a new co polymer line worth using as well - for example the 0.20mm dia TDR has a claimed breaking strain of 6lb, but when I tested it, the line broke at 6lb 10oz (this is an average of 4 tests).
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| Edited: 21/08/08 08:45 |
 Pressure = Force/area ie Pressure is a force distributed over an area. If you apply a given force over a smaller area then the pressure will be greater. Similarly, and more applicable to this issue: Stress (N/mm^2) = Force (N) / cross section area (mm^2) [of the line] The line (or any material) has a Yield Stress (YS) and an Ultimate Tensile Stress (UTS). The UTS is the stress that the line will break. If you apply a force F to two line of different diameter then there will be a greater stress in the smaller diameter line due to its lesser cross section area. If the line materials have the same UTS (in N/mm^2) then the thinner line will break before the thicker. However, the actuall UTS of each line will depend on the mechanical properties of the each material.
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U talkin out ya ar*e again Mr Corker?
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The tackle box shop conducts line tests for stated diameter,stated breaking strain and their own findings along with abrasion tests, very informative.
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U talkin out ya ar*e again Mr Corker?
No
I just took my anglers hat off and put my engineers hat on.
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 U talkin out ya ar*e again Mr Corker?
Iv'e got to say Paul, our Mr Corker is a boffin ,he's a very clever BOY, what he has written above is most likely fact.
But as far as you and I is concerned, a load of drivel and shite.
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 We could talk about the Elastic Modulus (E) [also known as Young's Modulus] of line material too. Thsi is a measure of its stiffness when under load and can be expressed as:
E = Stress / Strain
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"Thsi is a measure of its stiffness when under load and can be expressed as: E = Stress / Strain Thats exactly how my ex would have put it.
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Well i used the new stuff today, it certainly casts along way, cant say what its like when i get a run tho, i swear the aliens have transported all the Bream to the planet Poles bowl  Not had chance to test the breaking strain either, not overly sure i will yet, its all bit technical and im not sure id do it right. Matt, i have no idea what youre talking about
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 MoreSpiders was in engineering -- He'll explain it better if you ask him ...
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