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@Jonny69
Aren’t those string spokes going to be mega low modulus, i.e. you’ll have to stretch the living **** out of them before there’s enough tension on them?
Can’t help feeling that for the strength you actually need, you could use a much thinner UD carbon bootlace and you’d have both weight and cross-sectional area (=aero) on your side. If UTS of a steel spoke is let’s say 550MPa up to maybe 750MPa, UD strength of a strong fibre like T1100S is pushing 3700-3800MPa in the right resin and stiffness will probably be about the same as the steel.
Equivalent of a 1.4mm butted steel spoke would be a 0.3mm carbon bootlace, which would look a bit scary, but that’s basically what it would be!