I'm usually pretty good with math, but I'm missing something when trying to use the CCS formula to calculate lure casting weight range. For example, on a blank with and ERN of 4.9 (40 cents) , I came up with a lure weight range of .03-.09 oz. My expectation was to see something around .25 oz using the old fly line weight / 16 method. Any help here is greatly appreciated.

You can't really use fly line weight to determine lure casting weight as no two rods for the same line weight are necessarily intended to cast the same length of line, therefore they won't cast the same amount of lure weight.

If you'll consult the chart (page 19 RodMaker V10 #4 - Universal Rod Rating System/CCS) you will see that with an ERN of 4.9 you'd be looking at an average casting lure weight of right at 5/16th of an ounce.

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Tom, thank you for your response. In your opinion, is 1.5 & .8 times the average lure weight a reasonable range? Is the CCS formula off somehow? This is how I applied it in this case:

4.9 ERN = 40 Cents
(40x1.5)-20=Grains
60-20=40 grains
40x.0022857=.092oz as a top end lure weight. I know this is wrong but not seeing why.

That equation was only a stopgap until the final installment of the system was finalized. It's not what you want to use and in fact, wasn't developed by Dr. Hanneman.

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That makes sense. I'm trying hard to incorporate CCS into my building and couldn't make this work. Thanks again.