Some years ago I knew an engineer who designed power tools; that is, he sat at a drawing board where he conceived and drew the parts of machines, eventually to be manufactured into working products. He hated the way the term engineer was used to describe washing machine repair men and other sundry mechanics and technicians.
Grandiose terms to describe ordinary jobs and actions have become more common. Words like operative, executive, analyst are uninformative but sound important. Similar pretensions are part of angling too. The self-regarding like to talk about designing floats, flies, rigs, when at best all they are doing is tweaking ideas that have been around for decades or even centuries. Nowadays there are those who call themselves rod designers, typically anglers who are either employed full-time by a tackle company or as ‘ambassadors’.
This raises the question of how you make a fishing rod. If you search around the internet for information you’ll find videos which explain that rod design starts off with a rod blank, the tapering tube of carbon fibre (in modern rods) that is the fishing rod (without the rings and handle). How the blank comes about is not revealed but this is where the real design happens.
Rod blanks are made by cutting sheets of carbon fibre to specific patterns, rolling these on to a tapering steel rod called a mandrel and baking in an oven. The origin of these patterns and the shape of the mandrel are not explained in any of the sources I’ve looked at. Clearly an understanding of the modulus of the different materials is required, i.e. how it deforms under stress, along with other properties. Knowledge of mathematics used to calculate rod wall thickness and taper for a given application must also be a prerequisite.
Do those fishing names who claim to design rods have this knowledge? Almost certainly not. Anyway, I think that rod blanks are often produced in specialist factories; the tackle makers order blanks to some general bendiness specification. (Some such as Harrison Rods do both; their website points out that the term ‘rod design’ is often misused.) There must be a lot of trial and error in this, which is where our fisherman rod ‘designer’ comes in. Really they are not designers beyond coming up with very general statements of requirement — a certain length, soft or stiff or somewhere in between. A rod is manufactured and the prototype handed over for some waggling and casting. They are rod testers, not designers. Even more they are rod marketers. Names sell rods.
Those anglers who can genuinely claim to be rod designers are the handful of craftsmen like Edward Barder who build cane rods. But even here I suspect rod tapers are the product of careful experimentation and long experience rather than a complex computer-aided process.