we’d already seen some insights on fly rods and how they break by Tim Rajeff- Why and How Fly Rods Break & Understanding how fly rods break but it’s always good to get varying thoughts and opinions from different rod designers and today’s little treat comes straight from someone who needs no introduction; Gary Loomis.
in this article via KistlerRods Gary tells us about graphite blank modulus, what IM6-7 and 8 means, blank wall thickness and how all this combines to define rod actions and their strengths and weaknesses.
originally published in September 2011, that might seem like eons ago but apart from a few tweaks here and there the same principles are still around.
there’s no tech-geek talk and this is a most interesting read, here are a few excerpts.
“Loomis began by explaining that the identifiers IM6, IM7 and IM8 are the trade numbers used by the Hexcel Corp. to identify their product and is not an industry quality or material standard, although the Hercules Fibers produced by the Hexcel Corp. are the benchmark that most companies use to compare their materials.”
“What an angler needs to understand is how the word “modulus” pertains to graphite rods. Modulus is not a thread count, as many would have you believe. Modulus basically equates to stiffness.”
“But the misconception of brittleness still plagues them, and the reason for this is because as the modulus gets higher, the less material is needed and therefore used. This means that the wall thickness in the blank, which is basically a hollow tube, is thinner.”
be sure to click Gary’s big smile to access the complete article, enjoy !