>>2259490>>2259760>>2259792i'd say go for a 9 weight since you already opted for a 5 weight and kinda committed to the odd numbers imo. my philosophy is every other, so i own a 2, 4, 6, 8, and 10 weight. if you ran a complete set of every-other you'd have a 3, 5, 7, 9, and 11 weight. the power difference between a single line jump is negligible.
>>2259639>>2259540>>2259676>>2259534>>2259525there's literally no reason a fly rod wont work as a spinning rod. it will have plenty of inefficiency, dont worry, but it will very well be doable. i've built fly rods. i've built spinning rods. i've built spinning rods out of fly rods. all casting starts with the same principals
>payload has mass/inertia/momentum>the mass/inertia/momentum of the payload causes the rod to flex. this flex stores energy, and is referred to as the load.>the load is created maintained as long as it is accelerating against the momentum/inertia/mass of the payload>uppon stopping the rod, this loaded energy releases, slinging the payload forwardin a spinning rod, the payload is tied on to the end of a thin line, and the payload drags the line along for the ride. in a fly rod, the payload is contained in a thick line, which drags the fly along for the ride. a 200 grain shooting head on a 6 weight is not unreasonable. account for the fact that that 200 grains loads the rod by having its direction completely reversed. (200 grains is about 7/16ths of an ounce) and you can see there would be little to no issue getting it to load and cast most trout sized lures.
the only real issue is that a spinning reel would have on a fly rod is that it'd feel a bit awkward, and the stripping guide being so low would be a bit janky. the last concern is the spinning reel might not sit quite right in the reel seat, but that can probably be managed.
>pic related, the spinning rod i made from a fly rod 