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have you tweaked your design to accommodate more standard size bearings??? im here in the states and i was looking at the design and was wondering if you can change the sizes to say a skateboard bearing size??? i have plenty of those and the fact they only cost $6 for 12 and the sealed ones work forever!! currently have them in several projects going back 7yrs now

i love your design and im pondering on how i could modifiy the bearings to a smaller size but in all honesty im awful at this, turbines are my dream but can't wrap my head around the designs. electronics is my hobby and i can see how to setup a RPi to monitor the output but other than that im in the dark.........if you have the time contact me directly

what did you do in the rectifier bridge for the ampage to charge say a battery bank? i assumed you went in series to have a higher amps to charge but to be honest not 100% sure what the ideal amps are needed. i will do quick internet search for the usb output =]