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Have you considered adding a smaller-diameter "drive wheel" to the motor's actual shaft, rather than relying on the O.D. of the outrunner? Author is right, choice of motor KV and other parameters should allow all these parameters to be built into the motor, but since motor manufacturing isn't ideal and this market is small, perhaps turning a roller is worth a try.
The concept here is so elegant, and the execution so clean, it would be easy to forget how much work went into developing it. Thank goodness there are a gazillion photos and lots of explanation behind the scenes!This is a spectacular writeup of a very cool project. I've built "servo testers" into finished projects a number of times; costume and prop folks love 'em as a simple way to make something distant move or wave. Glad to see that technique becoming more widespread.
Bicycle BoosterPack: A 3D Printed Portable Electric Assist
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