Who could rewind my outrunner?

Originally Posted by crazyjr

it's been a while since i was in school, but i thought it was pi X diameter, not 2pi X diameter. if you do single diameter you get 40.82. Still moot point because if everything else is right, you are still looking at 90 mph and still need further reduction or lower kv

metallover's right... It's 2*pi*r to get circumference or a circle