RodMaker Volume 19 Issue #5 will mail on October 1st. Most subscribers will receive it around the middle to end of that month.

 

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6 Responses to “”

  • Jim Spooner:

    In reference to the article EFFECTS OF BLANK TRIMMING (page 14), the diagram on page 15 states that “overall blank power remains the same”.

    If the tip power is increased, which it does, the overall power also increases.

  • Tom:

    No, it remains the same. If the maximum deadlift power of a blank is say, 20 pounds, trimming the tip will not increase that amount. The blank will still have a maximum deadlift capacity of 20 pounds.

  • Jim Spooner:

    Can’t argue with that, but since “power” is generally thought of as a CCS (or RDA) value, the use of “dead lift” seems misleading or inapplicable in this context….especially since it isn’t mentioned in the article. The CCS/RDA power rating would be increased.

  • Tom:

    Actually the CCS ERN number isn’t going to change as you think it would. Remember, as you shorten the blank the distance it has to be deflected is also reduced so you don’t end up with much of a change in the ERN after all. Power is really a function of the lower 3rd of a rod blank. Trimming the tip doesn’t really affect that aspect of things. Under load the tip simply flattens out and releases the load to the lower portion of the blank. You could do some measurements and see how the ERN is affected.

    I would agree the author might have chosen better terminology instead of “overall power” to something like maximum power or deadlift capability.

  • Jim Spooner:

    The power increases aren’t dramatic, but significant. It’s impractical to convey my rod measurements on this venue, so I’ll email you.
    BTW, this is the best guideline I’ve seen for the effects of trimming rods. http://rodbuilding101.com/docs/ROD_BLANK_TRIMMING_EXTENDING_EFFECTS_on_LINE_LURE_RATING_ACTION_TABLE_.pdf

  • Jim Spooner:

    Just for the record, I measured one of my rods (CCS, not RDA/Big Pic) to determine how much the decrease in tip length affects the Power rating. I simply hung the weight bag from the 2nd guide from the tip top and recalculated for the “shortened” rod (weight req’d to deflect 1/3 of the overall length). It resulted in an increase in Power of slightly more than 48%, which I think effectively changes the ERN value (Ha). The action angle, of course, decreased, but not as much as what I’d have thought (from 70 deg to 65 deg). Although it’d be unusual to remove so much from a rod tip, it’s often useful to remove ½” to 1” to tweak a blank/rod to achieve a desired Power/Action. I should note that my rods are relatively short, so percentage values would be slightly higher.
    If Mike’s reference to “overall blank power” was indeed max power or deadlift capacity, as you suspect, then he might’ve been remiss in not indicating the effect of blank trimming (in the diagram) to the generally phrased blank’s Power (ERN, CCN, Big Pic, RDA, etc.) He does, however, say (2nd par under “Effects”) “Casting power is usually increased by cutting from the tip”. Presumably, if he contends that “overall Power” remains the same, he may be referring specifically to Tip Power and increased lure weight. “Power” to me is a term I interpret as the rod’s capacity not only to load and cast lures, but to define its optimum (not maximum) pulling (fish-fighting) capacity. (I.e., it’s stiffness and resistance to bending). I recognize the sub-sets within a Power rating such as tip-power, which can translate to a given lure weight range, but I don’t see it as independent of the “overall Power”.

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