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Originally Posted by coasty
Certainly not my experience ..A softer mid tip rod protects light tippets much better..
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With tip / fast action rod it is possible to produce more lifting power because when it bends its span becomes shorter.
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An explanation to that would be welcome...
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First we have to assume everything else is the same and this case carbon modulus and matrix are the same.
Then softer, flexier tip has less material so it is lighter and therefore "reacts" faster, easier against fish "wiggle". This is just my theory. I don't have enough experience to be sure that in real fishing conditions it is otherwise but current lighter rods are more efficient fish fighters that older and heavier. Often "faster" rods are stiffer which breaks tippet easier but then it is not rod ACTION issue anymore.
Following link lower picture show bend curves of the same power rods which have different actions: fast, medium fast and slow, which bend as much with same load. The tip action rod lever becomes shorter therefore with it is is easier to lift more weight. Again grip distance in rod handle (other side of the lever) has to be the same.
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Actually their power is not exactly the same because rod butts have an upward angle so slow rod has stored more potential energy because with same weight it has bent slightly more. But the bending mechanics is easy to see.