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i can't tell you how much effect changing the relative tube diameters so much will have booty,

faced with the same dilema a while back i went with the 6ft lengths and only up one tube size,

your fatter faster taper idea will be stiffer and stronger, and catch more wind, your top end is fat and slow tapered so the stronger bottom may be beneficial in your case,


id go with 6ft tubes for the radials with your solid rod for the top few feet but im sure you will get it working ok whatever tube diameter you use if you spend some time adjusting it.